Explosion-proof circuit for interphone earphone

Abstract

The utility model discloses an explosion-proof circuit used for an interphone earphone. The explosion-proof circuit comprises an anode signal input end, a cathode signal input end, a microphone circuit, a loudspeaker circuit and a switch switching circuit, and diodes, capacitors, resistors and inductors in the microphone circuit, the loudspeaker circuit and the switch switching circuit all adopt explosion-proof elements. According to the utility model, through reasonable element layout and circuit design, the safety and stability of the circuit in a potential explosive environment are ensured, the microphone circuit can accurately convert a sound signal into an electric signal, and the electric signal is output as sound through the loudspeaker circuit; and the switch switching circuit provides a flexible control function, so that a user can control the on-off of the circuit or switch the working state according to requirements, the explosion-proof performance is fully considered in the design of the whole circuit, the circuit can still work normally in a severe environment, and the safety of the user is protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to earphone explosion -proof circuit technical field, concretely relates to a kind of explosion -proof circuit for intercom earphone. BACKGROUND

[0002] Traditional intercom earphone circuit design can meet daily communication needs in most cases, but in some special environments, such as coal mine, chemical plant and other places where explosive gas or dust may exist, the traditional earphone circuit may cause explosion due to electric spark, electric arc or high temperature. Therefore, it is particularly important to design an explosion-proof earphone circuit. The design principle of explosion-proof electrical equipment is to isolate the sparks and arcs generated by electrical components from explosive mixtures through a specific shell and material, while being able to withstand the explosion pressure that may be generated without being damaged. SUMMARY

[0003] Therefore, the main purpose of the utility model is to provide an explosion-proof circuit for intercom earphone.

[0004] To achieve the above purpose, the technical solution of the utility model is as follows:

[0005] The utility model embodiment provides an explosion-proof circuit for intercom earphone, comprising:

[0006] Positive signal input terminal and negative signal input terminal;

[0007] Microphone circuit, connected with the positive signal input terminal and negative signal input terminal circuit, for receiving and converting sound signal;

[0008] Loudspeaker circuit, connected with the positive signal input terminal and negative signal input terminal circuit, for converting electrical signal into sound signal output;

[0009] Switching circuit, connected with the positive signal input terminal and negative signal input terminal circuit, for controlling the opening and closing of the voice input function of intercom;

[0010] Among them, the diode, capacitor, resistor and inductor in the microphone circuit, loudspeaker circuit and switching circuit are explosion-proof components.

[0011] In the above scheme, the microphone circuit comprises:

[0012] First resistor, second resistor, sixth resistor, for current limiting and voltage division;

[0013] First diode, second diode, third diode, for rectification and protection circuit;

[0014] First inductor, second inductor, for filtering and anti-interference;

[0015] The first capacitor, the second capacitor, the fourth capacitor and the sixth capacitor are used for energy storage and filtering.

[0016] The microphone is used for receiving a sound signal and converting it into an electric signal.

[0017] The positive signal input end is connected with the first end of the sixth capacitor and the first end of the first inductor after being connected with the negative electrode of the first diode in series with the first resistor, the second end of the first inductor is connected with the first end of the first capacitor, the first end of the second capacitor, the first end of the fourth capacitor, the negative electrode of the third diode, the first end of the sixth resistor and the first end of the microphone, the second end of the second inductor is connected with the second end of the first capacitor, the second end of the fourth capacitor, the second end of the sixth resistor and the second end of the microphone after being connected with the second end of the sixth capacitor and the negative electrode of the second diode in series with the second resistor, and the positive electrode of the first diode, the positive electrode of the second diode, the second end of the second capacitor and the positive electrode of the third diode are grounded.

[0018] In the scheme, the loudspeaker circuit comprises:

[0019] The third resistor and the fourth resistor are used for current limiting.

[0020] The third inductor and the fourth inductor are used for filtering and anti-interference.

[0021] The loudspeaker is used for converting an electric signal into a sound signal and outputting.

[0022] The positive signal input end is connected with the first end of the loudspeaker after being connected with the third inductor in series with the third resistor, and the negative signal input end is connected with the second end of the loudspeaker after being connected with the fourth inductor in series with the fourth resistor.

[0023] In the scheme, the switch switching circuit comprises:

[0024] The switching switch is used for controlling the opening and closing of the intercom.

[0025] The fifth resistor is used for current limiting.

[0026] The fifth capacitor is used for energy storage and filtering.

[0027] The positive signal input end is connected with the first end of the fifth capacitor and the first end of the switching switch after being connected with the fifth resistor, and the second end of the switching switch is connected with the negative signal input end.

[0028] Compared with the prior art, the utility model has the advantages of:

[0029] The utility model discloses a reasonable element layout and circuit design have guaranteed the safety and stability of circuit in potential explosive environment, and microphone circuit can accurately convert sound signal into electric signal and output as sound through loudspeaker circuit, and switch switching circuit provides flexible control function, makes user can control the on-off or switching operating condition of circuit according to need, and the design of whole circuit has fully considered the explosion -proof performance, ensures that still can work normally under the harsh environment and protects the safety of user. BRIEF DESCRIPTION OF DRAWINGS

[0030] The drawings described herein are used to disclose the further understanding of the utility model, constitute a part of the utility model, and the illustrative embodiment and the explanation thereof of the utility model are used to explain the utility model, and do not constitute the improper limitation of the utility model.

[0031] Figure 1 It is the structural schematic diagram of microphone circuit of the utility model embodiment described in the utility model embodiment;

[0032] Figure 2 It is the structural schematic diagram of microphone circuit of the utility model embodiment described in the utility model embodiment;

[0033] Figure 3 It is the structural schematic diagram of switch switching circuit of the utility model embodiment described in the utility model embodiment. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is in combination with the drawing and embodiment, and the utility model is further detailedly explained.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0035] The same or similar reference numerals in the drawings of the embodiment correspond to the same or similar parts;In the description of the utility model, it should be understood that the terms "first", "second", "third" and the like are only used to facilitate the differentiation of the same components, and do not indicate or imply the number of the components referred to, and should not be understood as the limitation of the patent, and the specific meaning of the above terms can be understood according to the specific situation for the ordinary skilled in the art.

[0036] It should be noted that, in this paper, the term "including", "containing" or any other variant thereof is intended to cover non-exclusive containing, so that the process, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes the elements inherent in such process, article or device.In the absence of more limitations, the element defined by the sentence "including a…" does not exclude the existence of other identical elements in the process, article or device including the element.

[0037] The utility model embodiment provides a kind of for intercom earphone's explosion-proof circuit, as shown in Figures 1-3 Including:

[0038] Positive signal input end V1 and negative signal input end V2;

[0039] Microphone circuit, with the positive signal input end V1 and negative signal input end V2 circuit connection, for receiving and converting sound signal;

[0040] Loudspeaker circuit, with the positive signal input end V1 and negative signal input end V2 circuit connection, for converting electrical signal into sound signal output;

[0041] Switching circuit, with the positive signal input end V1 and negative signal input end V2 circuit connection, for controlling the opening and closing of the voice input function of intercom;

[0042] Among them, the diode, capacitor, resistor and inductor in the microphone circuit, loudspeaker circuit and switching circuit are all explosion-proof components.

[0043] As shown in Figure 1 The microphone circuit includes:

[0044] First resistor R1, second resistor R2, sixth resistor R6 are used for current limiting and voltage division;

[0045] First diode D1, second diode D2, third diode D3 are used for rectification and protection circuit;

[0046] First inductor L1, second inductor L2 are used for filtering and anti-interference;

[0047] First capacitor C1, second capacitor C2, fourth capacitor C4, sixth capacitor C6 are used for energy storage and filtering;

[0048] Microphone MIC is used for receiving sound signal and converting into electrical signal;

[0049] The positive signal input end V1 is connected with the first end of the fifth capacitor C5 and the first end of the switching switch PTT after connecting with the fifth resistor R5 in series, and the second end of the switching switch PTT is connected with the negative signal input end V2.

[0050] As shown in Figure 2 The speaker circuit comprises:

[0051] The third resistor R3 and the fourth resistor R4 are used for current limiting.

[0052] The third inductor L3 and the fourth inductor L4 are used for filtering and anti-interference.

[0053] The speaker SPK is used for converting an electric signal into an acoustic signal and outputting.

[0054] The positive signal input end V1 is connected with the first end of the speaker SPK after connecting with the third resistor R3 and the third inductor L3 in series, and the negative signal input end V2 is connected with the second end of the speaker SPK after connecting with the fourth resistor R4 and the fourth inductor L4 in series.

[0055] As shown in Figure 3 The switch switching circuit comprises:

[0056] The switching switch PTT is used for controlling the opening and closing of the intercom.

[0057] The fifth resistor R5 is used for current limiting.

[0058] The fifth capacitor C5 is used for energy storage and filtering.

[0059] The positive signal input end V1 is connected with the first end of the fifth capacitor C5 and the first end of the switching switch PTT after connecting with the fifth resistor R5 in series, and the second end of the switching switch PTT is connected with the negative signal input end V2.

[0060] The working principle of the utility model is as follows:

[0061] As shown in Figures 1-3As shown, the circuit is an anti-explosion circuit for a speakerphone headset, mainly including a positive signal input terminal V1, a negative signal input terminal V2, a microphone circuit, a speaker circuit, and a switch switching circuit. The following is a detailed description of the working principle of each circuit part:

[0062] The positive signal input terminal V1 and the negative signal input terminal V2 serve as the input of the audio signal.

[0063] The main function of the microphone circuit is to convert sound signals into electrical signals. When sound acts on the microphone MIC, the sensor inside the microphone MIC will generate corresponding electrical signals.

[0064] Resistors: The first resistor R1, the second resistor R2, and the sixth resistor R6 play the role of current limiting and voltage division in the circuit, protecting other elements in the circuit from excessive current impact.

[0065] Diodes: The first diode D1, the second diode D2, and the third diode D3 play the role of rectification and protection of the circuit. They can prevent the reverse flow of current, thereby protecting the elements in the circuit from damage.

[0066] Inductors: The first inductor L1 and the second inductor L2 are used for filtering and anti-interference, ensuring that the electrical signals output by the microphone MIC are pure and stable.

[0067] Capacitors: The first capacitor C1, the second capacitor C2, the fourth capacitor C4, and the sixth capacitor C6 are used for energy storage and filtering, further smoothing the electrical signals output by the microphone MIC.

[0068] When the sound signal acts on the microphone MIC, the microphone MIC converts the sound into an electrical signal, which is processed by the above-mentioned elements and then output to the speaker SPK circuit or subsequent processing circuit.

[0069] The main function of the speaker circuit is to convert the electrical signals output by the microphone circuit into sound signals and output them.

[0070] Resistors: The third resistor R3 and the fourth resistor R4 play the role of current limiting in the circuit, protecting the speaker SPK from excessive current impact.

[0071] Inductors: The third inductor L3 and the fourth inductor L4 are used for filtering and anti-interference, ensuring that the sound output by the speaker SPK is pure and stable.

[0072] When the electrical signals output by the microphone circuit act on the speaker SPK, the electromagnet inside the speaker SPK will generate a corresponding magnetic field, causing the speaker SPK diaphragm to vibrate, thereby emitting sound.

[0073] The switch switching circuit is used for controlling the on-off of the voice input of the intercom or switching different working states.

[0074] The switch PTT is used for manually controlling the on-off of the voice input of the intercom or switching different working states.

[0075] The fifth resistor R5 plays a role of current limiting in the circuit, protecting the switch from the impact of excessive current.

[0076] The fifth capacitor C5 is used for energy storage and filtering, ensuring smooth transition of the circuit when the switch operates.

[0077] By operating the switch PTT, the user can control the voice input of the intercom.

[0078] The explosion-proof circuit ensures the safety and stability of the circuit in a potentially explosive environment through reasonable component layout and circuit design.

[0079] The above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application.

Claims

1. An explosion-proof circuit for a walkie-talkie headset, characterized in that, The utility model relates to a speakerphone, including: Positive signal input end and negative signal input end; Microphone circuit, with the positive signal input end and negative signal input end circuit connection, be used for receiving and converting sound signal; Loudspeaker circuit, with the positive signal input end and negative signal input end circuit connection, be used for converting electric signal into sound signal output; Switch switching circuit, with the positive signal input end and negative signal input end circuit connection, be used for controling the opening and closing of the voice input function of speakerphone; Wherein, the diode, capacitor, resistor and inductor in microphone circuit, loudspeaker circuit and switch switching circuit all adopt explosion -proof type element.

2. A circuit for a speakerphone earpiece according to claim 1, wherein, The utility model relates to a speakerphone, including: First resistor, second resistor, sixth resistor are used for current -limiting and voltage division; First diode, second diode, third diode are used for rectification and protection circuit; First inductance, second inductance are used for filtering and anti -interference; First capacitor, second capacitor, fourth capacitor, sixth capacitor are used for energy storage and filtering; Microphone is used for receiving sound signal and converting into electric signal; The positive signal input end is connected in series first resistor after respectively with the negative pole of first diode, the first end of sixth capacitor and the first end of first inductance, the second end of first inductance is connected with the first end of first capacitor, the first end of second capacitor, the first end of fourth capacitor, the negative pole of third diode, the first end of sixth resistor and the first end of microphone respectively, the negative signal input end is connected in series second resistor after respectively with the second end of sixth capacitor, the negative pole of second diode and the first end of second inductance, the second end of second inductance is connected with the second end of first capacitor, the second end of fourth capacitor, the second end of sixth resistor and the second end of microphone respectively, the positive pole of first diode, the positive pole of second diode, the second end of second capacitor, the positive pole of third diode are all grounded.

3. A circuit for a speakerphone earpiece according to claim 2, wherein, The utility model relates to a speakerphone, including: Third resistor, fourth resistor are used for current -limiting; Third inductance, fourth inductance are used for filtering and anti -interference; Loudspeaker is used for converting electric signal into sound signal output; The positive signal input end is connected with the first end of loudspeaker after being connected in series third resistor and third inductance in proper order, and the second end of loudspeaker is connected with the second end of negative signal input end after being connected in series fourth resistor and fourth inductance.

4. A circuit for a speakerphone earpiece according to claim 3, wherein, The utility model relates to a speakerphone, including: Switching switch is used for controling the opening and closing of speakerphone; Fifth resistor is used for current -limiting; Fifth capacitor is used for energy storage and filtering; The positive signal input end is connected with the first end of fifth capacitor and the first end of switching switch after being connected in series fifth resistor, and the second end of switching switch is connected with negative signal input end.

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