Intrinsic safety circuit structure capable of reducing inductance

Abstract

The utility model discloses an intrinsic safety circuit structure capable of reducing inductance. The intrinsic safety circuit structure comprises a diode D1, a diode D2, a diode D3, a resistor R1, a resistor R2 and a resistor R3. The diode D1, the diode D2, the diode D3 and the resistor R3 are connected in parallel, one end of the resistor R1 is connected with one end of the resistor R3, the other end of the resistor R1 is connected with a positive electrode of a power supply, one end of the resistor R2 is connected with the other end of the resistor R3, and the other end of the resistor R2 is connected with a negative electrode of the power supply. According to the intrinsic safety circuit, the inductance of the whole circuit is greatly reduced, meanwhile, a good current limiting effect on the circuit is achieved, the current and the voltage are greatly reduced, sparks and even explosion are prevented from being generated, and the safety performance of the intrinsic safety circuit is improved.

Description

Technical Field

[0001] The utility model relates to an intrinsically safe circuit, in particular to an intrinsically safe circuit structure capable of reducing inductance. Background Art

[0002] At present, in the fine chemical or petroleum industry, the traditional intrinsically safe circuit for solenoid valves only adds a bridge rectifier diode, so that the positive and negative poles of the circuit are not affected, and at the same time, the current of the back electromotive force can be reduced by passing through the rectifier diode, but the effect is poor. The traditional intrinsically safe circuit structure of the solenoid valve does not even add a rectifier diode, but this structure has an unsatisfactory effect during the experiment. Due to the increase in inductance, it is easy to generate sparks or even explode, and the safety performance cannot be guaranteed. Content of the Utility Model

[0003] To solve the defects of the above-mentioned prior art, the utility model provides an intrinsically safe circuit structure capable of reducing inductance. The utility model greatly reduces the inductance of the whole circuit, and at the same time plays a good current limiting role in the circuit, with a significant decrease in current and voltage, preventing the generation of sparks or even explosion, and improving the safety performance of the intrinsically safe circuit.

[0004] To achieve the above technical purpose, the utility model adopts the following technical scheme: an intrinsically safe circuit structure capable of reducing inductance, including diode D1, diode D2, diode D3, resistor R1, resistor R2, resistor R3; the diode D1, the diode D2, the diode D3, and the resistor R3 are connected in parallel, one end of the resistor R1 is connected to one end of the resistor R3 and the other end is connected to the positive pole of the power supply, and one end of the resistor R2 is connected to the other end of the resistor R3 and the other end is connected to the negative pole of the power supply.

[0005] Further, the models of the diode D1, the diode D2, and the diode D3 are all M7.

[0006] Further, the model of the resistor R1 is CRH2512F43R0, the model of the resistor R2 is CRH2512F75R0, and the model of the resistor R3 is CRH2512F2.4KR0.

[0007] Further, a current limiting circuit is further included. The current limiting circuit includes a resistor R4, a diode D4, a triode Q1, a triode Q2, and a resistor R5. One end of the resistor R4 is connected to the positive pole of the power supply, and the other end is connected to the positive pole of the diode D4. The negative pole of the diode D4 is connected to the base of the triode Q1. The collector of the triode Q1 is connected to VCC. The emitter of the triode Q1 is divided into two paths. The first path is connected to the resistor R5, and the other end of the resistor R5 is connected to the base of the triode Q1. The second path is connected to the base of the triode Q2. The collector of the triode Q2 is connected to VCC. The emitter of the triode Q2 is connected to the positive pole of the resistor R1.

[0008] In summary, the following technical effects are achieved by the present utility model:

[0009] The present utility model adds a resistor R3, which can greatly reduce the inductance of the entire circuit. Adding the resistor R1 and the resistor R2 can play a role in current limiting for a single circuit. Compared with the traditional intrinsically safe circuit of the solenoid valve, the current and voltage are greatly reduced, avoiding the generation of sparks or explosions, and having good safety performance.

[0010] The present utility model sets a current limiting circuit to further enhance the current limiting effect and ensure the safety of the intrinsically safe circuit.

[0011] The present utility model reduces the current to a set value, and the inductance of the overall circuit is greatly reduced. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of an intrinsically safe circuit that can reduce inductance provided by an embodiment of the present utility model;

[0013] Figure 2 is Figure 1 a schematic structural diagram of an intrinsically safe circuit with an added current limiting circuit. Detailed Embodiment

[0014] The following further details the present utility model with reference to the drawings.

[0015] This specific embodiment is only an explanation of the present utility model, and it is not a limitation of the present utility model. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as it is within the scope of the claims of the present utility model, it is protected by the patent law.

[0016] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0017] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0018] In the present utility model, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0019] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0020] Embodiment:

[0021] Figure 1It is a schematic diagram of an intrinsically safe circuit structure that can reduce inductance, including diode D1, diode D2, diode D3, resistor R1, resistor R2, and resistor R3; the diode D1, the diode D2, the diode D3, and the resistor R3 are connected in parallel, one end of the resistor R1 is connected to one end of the resistor R3, and the other end is connected to the positive pole of the power supply, and one end of the resistor R2 is connected to the other end of the resistor R3, and the other end is connected to the negative pole of the power supply.

[0022] In the present utility model, three diodes D1, D2, and D3 are connected in parallel to reduce the back electromotive force, and a resistor R3 is further connected in parallel, which can significantly reduce the inductance of the entire circuit. Setting R1 and R2 at both ends can play a role in current limiting for a single circuit, realizing inductance reduction and current limiting, preventing the generation of sparks or even explosions, and improving the safety performance of the intrinsically safe circuit.

[0023] In this embodiment, the models of the diode D1, the diode D2, and the diode D3 are all M7. The model of the resistor R1 is CRH2512F43R0, the model of the resistor R2 is CRH2512F75R0, and the model of the resistor R3 is CRH2512F2.4KR0.

[0024] In another embodiment, as Figure 2 shown, it further includes a current limiting circuit, and the current limiting circuit includes a resistor R4, a diode D4, a triode Q1, a triode Q2, and a resistor R5. One end of the resistor R4 is connected to the positive pole of the power supply, and the other end is connected to the positive pole of the diode D4. The negative pole of the diode D4 is connected to the base of the triode Q1. The collector of the triode Q1 is connected to VCC. The emitter of the triode Q1 is divided into two paths. The first path is connected to the resistor R5, and the other end of the resistor R5 is connected to the base of the triode Q1. The second path is connected to the base of the triode Q2. The collector of the triode Q2 is connected to VCC. The emitter of the triode Q2 is connected to the positive pole of the resistor R1.

[0025] The resistor R4 is a current limiting resistor for limiting the current flowing into the diode D4. The diode D4 is a voltage stabilizing diode that stabilizes the input voltage at 24VDC. Q1 serves as a reference current, and the resistor R5 is a bias resistor to ensure the stable operation of Q1. The base current of Q2 is the same as the emitter current of Q1, ensuring that the current reaching the subsequent circuit is within the safe range.

[0026] This embodiment sets a current limiting circuit, uses a voltage stabilizing diode and a triode Q1 to limit the initial current, uses Q2 and R1 to limit the current flowing to the subsequent circuit, and cooperates with the resistor R2 to achieve a good current limiting effect, further improving the safety performance and preventing sparks or explosions.

[0027] During production, the sealed area within the dashed line box is sealed with epoxy resin 808A / B-H.

[0028] The above description is only a preferred embodiment of the present invention and does not impose any formal restrictions on the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention are all within the scope of the technical solution of the present invention.

Claims

1. An intrinsically safe circuit structure capable of reducing inductance, characterized in that: It includes diode D1, diode D2, diode D3, resistor R1, resistor R2, and resistor R3; the diode D1, the diode D2, the diode D3, and the resistor R3 are connected in parallel, one end of the resistor R1 is connected to one end of the resistor R3, and the other end is connected to the positive pole of the power supply, and one end of the resistor R2 is connected to the other end of the resistor R3, and the other end is connected to the negative pole of the power supply.

2. The intrinsically safe circuit structure capable of reducing inductance according to claim 1, wherein: The models of the diode D1, the diode D2, and the diode D3 are all M7.

3. A intrinsically safe circuit structure capable of reducing inductance according to claim 1, characterized in that: The model of the resistor R1 is CRH2512F43R0, the model of the resistor R2 is CRH2512F75R0, and the model of the resistor R3 is CRH2512F2.4KR0.

4. A intrinsically safe circuit structure capable of reducing inductance according to claim 1, characterized in that: It further includes a current limiting circuit, and the current limiting circuit includes resistor R4, diode D4, triode Q1, triode Q2, and resistor R5. One end of the resistor R4 is connected to the positive pole of the power supply, and the other end is connected to the positive pole of the diode D4. The negative pole of the diode D4 is connected to the base of the triode Q1. The collector of the triode Q1 is connected to VCC. The emitter of the triode Q1 is divided into two paths. The first path is connected to the resistor R5, and the other end of the resistor R5 is connected to the base of the triode Q1. The second path is connected to the base of the triode Q2. The collector of the triode Q2 is connected to VCC. The emitter of the triode Q2 is connected to the positive pole of the resistor R1.

Images