Near-electricity alarm circuit and device

Abstract

The utility model relates to the technical field of near-electricity alarms, in particular to a near-electricity alarm circuit and device, and the circuit comprises a detection starting module, a voltage grade selection module, a near-electricity output module and an alarm triggering module. The detection starting module is used for controlling power supply according to a signal output by an external MCU (Microprogrammed Control Unit); the voltage grade selection module is used for selecting a corresponding voltage selection subunit according to the selection sent by the MCU so as to select a corresponding voltage grade; after the corresponding voltage level is selected, if alternating current input is sensed, the near-electricity output module outputs an alarm trigger signal, and the alarm trigger module gives an alarm according to the alarm trigger signal. The near-electricity alarm device has the advantages that the near-electricity alarm device can be adapted to various voltage grades, and performance reduction or damage of the near-electricity alarm device caused by voltage mismatching is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of proximity alarms, and in particular to a proximity alarm circuit and device. Background Art

[0002] The near-electric alarm is a safety auxiliary tool that can issue a continuous alarm sound when the user approaches a high-voltage power source or a live area. It can issue a continuous alarm sound when the user approaches a strong power source and a high-voltage power source, prompting construction workers or other workers to pay attention to the possible electrical hazards around them, thereby reminding them of the possible dangers. However, the near-electric alarm needs to use different voltage levels in different working environments and conditions to match the power supply voltage provided on site, otherwise the performance of the near-electric alarm may be reduced or damaged due to voltage mismatch.

[0003] Therefore, how to adapt to multiple voltage levels and avoid performance degradation or damage of the proximity alarm due to voltage mismatch is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The embodiments of the present application provide a near-electricity alarm circuit and device, which can achieve the beneficial effect of adapting to multiple voltage levels and avoiding performance degradation or damage of the near-electricity alarm due to voltage mismatch.

[0005] In a first aspect, the present application provides a near-electricity alarm circuit: a near-electricity alarm circuit comprising a detection start module, a voltage level selection module, a near-electricity output module and an alarm trigger module;

[0006] The detection start module includes a start control terminal, a power supply receiving terminal and a power supply output terminal, the voltage level selection module includes a potential selection terminal and a potential adjustment terminal, the near-electric output module includes a signal sensing terminal to be tested, a reference potential terminal, a first power supply terminal and a determination output terminal, and the alarm trigger module includes a second power supply terminal and an alarm trigger terminal;

[0007] The detection start module is used to control the power supply of the near-electric output module and the alarm trigger module, and includes a first switch component and a second switch component. The start control end is used to receive a DC signal sent by an external MCU to control the on and off of the second switch component. The power supply receiving end is connected to an external DC signal source and is used to output a DC power supply signal to the first power supply end and the second power supply end when the second switch component is turned on.

[0008] The voltage level selection module includes a plurality of voltage selection subunits, one of the voltage selection subunits corresponds to an enabling voltage level, and is used to determine a corresponding voltage selection subunit to be turned on according to the enabling voltage level, the potential selection terminal is used to receive a voltage level adjustment signal sent by the MCU, and turn on the corresponding voltage selection subunit according to the voltage level adjustment signal to start the near-electric output module, and the potential adjustment terminal is connected to the reference potential terminal;

[0009] The signal-to-be-tested sensing end is used to receive an external signal to be tested, and determine the input potential of the signal-to-be-tested sensing end according to the signal to be tested, and the near-electric output module is used to output an alarm triggering DC signal to the alarm triggering end according to the input potential and the reference potential;

[0010] The alarm trigger module includes an alarm device and a third switch device, which is used to control the on and off of the third switch device according to the alarm trigger DC signal. When the third switch device is turned on, the output DC power supply signal is output to the ground through the alarm device.

[0011] By adopting the above technical scheme, according to different power supply voltage levels in actual operation, the corresponding voltage adjustment level signal can be sent through the MCU to control the corresponding voltage selection subunit to be turned on; on the other hand, the MCU sends a DC signal to the detection start module, and the detection start module starts the power supply according to the DC signal, thereby providing power supply conditions for the near-electricity output module output and the alarm trigger module. If the power supply conditions are complete and there is a turned-on voltage selection subunit, an alarm trigger DC signal is output to trigger the alarm, thereby adapting to multiple voltage levels and avoiding performance degradation or damage of the near-electricity alarm due to voltage mismatch.

[0012] Optionally, the detection start module includes a first triode, a first resistor, a second resistor, and a first transistor;

[0013] The base of the first transistor is connected to one end of the first resistor, and the other end of the first resistor is connected to the MCU, so as to receive a DC signal sent by the MCU;

[0014] The connection point between the first resistor and the first transistor is connected to one end of the second resistor, and the other end of the second resistor is grounded;

[0015] The emitter of the first transistor is grounded, the collector is connected to an external first DC signal source, the first DC signal source is also connected to the gate of the first transistor, the source of the first transistor is connected to an external second DC signal source, and the drain of the first transistor is connected to the first power supply terminal and the second power supply terminal.

[0016] By adopting the above technical solution, the MCU outputs a DC signal, and the first transistor is turned on after receiving the signal, thereby lowering the gate potential of the first transistor, thereby turning on the first transistor. After the first transistor is turned on, the second DC signal source can power the near-electric output module and the alarm trigger module through the first transistor.

[0017] Optionally, the voltage selection subunit includes a PNP sub-transistor, a first sub-resistor, and a second sub-resistor;

[0018] The base of the PNP sub-transistor is connected to one end of the first sub-resistor, and the other end of the first sub-resistor is connected to an external Bluetooth signal source;

[0019] The connection point between the first sub-resistor and the PNP sub-transistor is correspondingly connected to the voltage selection terminal of the MCU;

[0020] The emitter of the PNP sub-transistor is connected to one end of the second sub-resistor, the other end of the second sub-resistor is connected to the reference potential end, and the collector of the PNP sub-transistor is grounded.

[0021] By adopting the above technical solution, the MCU sends a voltage level adjustment signal to the corresponding voltage selection sub-unit, that is, adjusts the base potential of the corresponding PNP sub-transistor, thereby adjusting the on-state voltage drop of the PNP sub-transistor according to the sensed voltage of the signal source to be measured, thereby avoiding voltage mismatch that causes excessive on-state voltage drop and damages the device.

[0022] Optionally, the near-electric output module includes an operational amplifier;

[0023] The sensing end of the operational amplifier is connected to an external signal source to be measured, the reference voltage end of the operational amplifier is connected to the potential adjustment end, the power supply end of the operational amplifier is connected to the drain of the first transistor, and the output end of the operational amplifier is connected to the alarm trigger end.

[0024] By adopting the above technical solution, an operational amplifier is used for proximity alarm. If a person is close to a charged object, the operational amplifier processes and outputs an alarm trigger signal to the alarm trigger module. The alarm trigger module will perform an alarm action based on this signal, thereby prompting relevant personnel to approach the charged object.

[0025] Optionally, the near-electric output module further includes a first capacitor; the first capacitor is connected to a connection point between the operational amplifier and the signal source to be measured.

[0026] By adopting the above technical solution, the ripple of the sensed input signal is processed according to the filtering characteristics of the capacitor to avoid false alarms and misjudgments caused by signal interference, thereby improving circuit reliability.

[0027] Optionally, the alarm trigger module includes a first alarm, a second triode, and a third resistor;

[0028] One end of the first alarm is connected to the drain of the first transistor, and the other end is connected to the collector of the second triode, the base of the second triode is connected to one end of the third resistor, and the other end of the third resistor is connected to the output end of the operational amplifier;

[0029] The emitter of the second transistor is grounded.

[0030] By adopting the above technical solution, the second transistor is turned on after receiving the signal output by the operational amplifier, so that the second signal source is connected to the ground through the first transistor, the first alarm and the second transistor, so that the first alarm performs an audio alarm.

[0031] Optionally, the alarm trigger module further includes a third triode, a fourth resistor, and a fifth resistor;

[0032] The base of the third transistor is connected to the connection point of the second transistor and the third resistor;

[0033] The collector of the third transistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the Bluetooth signal source;

[0034] The emitter of the third transistor is grounded, the connection between the third transistor and the fourth resistor is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the alarm signal detection end of the MCU.

[0035] By adopting the above technical solution, the third transistor is controlled to be on and off by the signal output by the operational amplifier, thereby adjusting the pulse output to the MCU. The MCU can perform corresponding near-electrical alarm operations according to the changes in the received pulse output, thereby realizing the near-electrical alarm function.

[0036] A second aspect of the present application provides a proximity alarm device equipped with the proximity alarm circuit as described above.

[0037] In summary, the present application includes at least one of the following beneficial effects:

[0038] 1. According to the different power supply voltage levels in actual operation, the corresponding voltage adjustment level signal can be sent through the MCU to control the corresponding voltage selection subunit to be turned on; on the other hand, the MCU sends a DC signal to the detection start module, and the detection start module starts the power supply according to the DC signal, thereby providing power supply conditions for the near-electric output module output and the alarm trigger module. If the power supply conditions are complete and there is a turned-on voltage selection subunit, the alarm trigger DC signal is output to trigger the alarm, thereby adapting to multiple voltage levels to avoid performance degradation or damage to the near-electric alarm due to voltage mismatch.

[0039] 2. The MCU outputs a DC signal, and the first transistor is turned on after receiving the signal, thereby lowering the gate potential of the first transistor, thereby turning on the first transistor. After the first transistor is turned on, the second DC signal source can power the near-electric output module and the alarm trigger module through the first transistor.

[0040] 3. Use an op amp to perform proximity alarm. If you are close to a charged object, the op amp will process and output an alarm trigger signal to the alarm trigger module. The alarm trigger module will perform an alarm action based on this signal, thereby prompting relevant personnel to approach a charged object. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a module connection diagram of the near-electricity alarm circuit provided in an embodiment of the present application;

[0042] Figure 2 It is a circuit schematic diagram of the near-electricity alarm circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] The following examples will help those skilled in the art to further understand the effects of the present application, but are not intended to limit the present application in any form. It should be noted that, for those of ordinary skill in the art, several modifications and improvements may be made without departing from the concept of the present application. These all fall within the scope of protection of the present application.

[0044] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0045] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0046] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0047] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0048] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0049] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. The present application is further described in detail below in conjunction with the accompanying drawings.

[0050] Reference Figure 1 , which is a module connection diagram of the near-electricity alarm circuit provided in the embodiment of the present application, including a detection start module 1, a voltage level selection module 2, a near-electricity output module 3 and an alarm trigger module 4. The following is a specific description of each module in the embodiment proposed in the present application:

[0051] The detection start module 1 includes a start control terminal, a power supply receiving terminal and a power supply output terminal, the voltage level selection module 2 includes a potential selection terminal and a potential adjustment terminal, the near-electric output module 3 includes a signal sensing terminal to be tested, a reference potential terminal, a first power supply terminal and a determination output terminal, and the alarm trigger module 4 includes a second power supply terminal and an alarm trigger terminal;

[0052] Regarding the detection start module 1: the detection start module 1 is used to control the power supply of the near-electric output module 3 and the alarm trigger module 4, and includes a first switch element and a second switch element. The start control end is used to receive a DC signal sent by an external MCU to control the on and off of the second switch element. The power supply receiving end is connected to an external DC signal source to output a DC power supply signal to the first power supply end and the second power supply end when the second switch element is turned on.

[0053] Specifically, the detection start module 1 is used to control the power supply on and off of the circuit in this embodiment, that is, to control the start or shut down of the near-electricity alarm function, which includes two switch elements. Through the combination of the two switch elements, when the MCU sends the corresponding DC signal, the first switch element and the second switch element are turned on, and the external DC signal source will output a DC signal through the second switch element to the power supply end corresponding to the near-electricity output module 3 and the alarm trigger module 4, thereby providing power support for the subsequent near-electricity alarm.

[0054] Regarding the voltage level selection module 2: the voltage level selection module 2 includes multiple voltage selection sub-units, one of the voltage selection sub-units corresponds to an enabling voltage level, and is used to determine the corresponding voltage selection sub-unit to be turned on according to the enabling voltage level, the potential selection end is used to receive the voltage level adjustment signal sent by the MCU, and according to the voltage level adjustment signal, turn on the corresponding voltage selection sub-unit to start the near-electric output module 3, and the potential adjustment end is connected to the reference potential end.

[0055] Specifically, the voltage level selection module 2 includes multiple parallel voltage selection sub-units, each voltage selection sub-unit corresponds to a voltage level, including but not limited to 220V, 10KV, 35KV, 110KV and 220KV, so as to adapt to the voltage levels in different usage scenarios to avoid damage to devices due to voltage mismatch, and adapt to various near-electric alarm demand scenarios. In this embodiment, there are five voltage levels, that is, five voltage selection sub-units are correspondingly set.

[0056] Regarding the near-electric output module 3: the test signal sensing end is used to receive an external test signal, and determine the input potential of the test signal sensing end according to the test signal. The near-electric output module 3 is used to output an alarm trigger DC signal to the alarm trigger end according to the input potential and the reference potential.

[0057] Specifically, the near-electricity output module 3 includes a near-electricity alarm chip, which can be regarded as an operational amplifier. The input end of the operational amplifier senses the external AC input, that is, the signal to be tested. If there is AC input, and the voltage level selection module 2 switches to the corresponding voltage selection subunit to conduct the path from the signal to be tested and the voltage selection subunit to the ground, the potential will be adjusted accordingly at the input end and the reference voltage end of the near-electricity alarm, thereby outputting a corresponding high-level signal at the output end of the near-electricity alarm chip, that is, the alarm trigger DC signal described below.

[0058] Regarding the alarm trigger module 4: the alarm trigger module 4 includes an alarm device and a third switch device, which is used to control the on and off of the third switch device according to the alarm trigger DC signal. When the third switch device is turned on, the output DC power supply signal is output to the ground through the alarm device.

[0059] Specifically, if the near-electric alarm chip outputs a corresponding alarm trigger DC signal, the third switch will be turned on accordingly, so that the DC signal of the detection start module 1 passes through the alarm and the third transistor to the ground to form a path, where the alarm includes but is not limited to LED warning lights and audio players such as buzzers.

[0060] Reference Figure 2 , Figure 2 This is a circuit diagram of a near-electricity alarm circuit provided in an embodiment of the present application, combined with Figure 2 The above modules are described at the component level, and the following is a detailed description:

[0061] The detection start module includes a first transistor Q1, a first resistor R1, a second resistor R2, and a first transistor M1;

[0062] The base of the first transistor Q1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the MCU, so as to receive a DC signal sent by the MCU;

[0063] The connection point between the first resistor R1 and the first transistor Q1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is grounded;

[0064] The emitter of the first transistor Q1 is grounded, and the collector is connected to an external first DC signal source VCC1. The first DC signal source VCC1 is also connected to the gate of the first transistor M1. The source of the first transistor M1 is connected to an external second DC signal source VCC2. The drain of the first transistor M1 is connected to the first power supply terminal and the second power supply terminal.

[0065] Specifically, the first resistor receives a signal sent by the MCU, and the signal is used to control the power supply of the operational amplifier described below. In this embodiment, the operational amplifier used, that is, the near-electricity alarm chip can use a JW0818 chip. The first transistor is turned on after receiving the signal, so that the signal of the first DC signal source is changed from being output to the gate of the first transistor to being output to the ground through the first transistor, and the potential of the first transistor is pulled down. Since the first transistor uses PMOS in this embodiment, the gate is pulled down to turn on the first transistor, so that the signal output by the second DC signal source can power the near-electricity alarm chip and the alarm device through the first transistor.

[0066] Further, the voltage selection subunit includes a PNP sub-transistor, a first sub-resistor, and a second sub-resistor;

[0067] The base of the PNP sub-transistor is connected to one end of the first sub-resistor, and the other end of the first sub-resistor is connected to an external Bluetooth signal source;

[0068] The connection point between the first sub-resistor and the PNP sub-transistor is correspondingly connected to the voltage selection terminal of the MCU;

[0069] The emitter of the PNP sub-transistor is connected to one end of the second sub-resistor, the other end of the second sub-resistor is connected to the reference potential end, and the collector of the PNP sub-transistor is grounded.

[0070] Specifically, a voltage selection subunit is set corresponding to the voltage level set according to actual needs. In the present embodiment, there are five voltage levels, namely 220V, 10KV, 35KV, 110KV and 220KV. For the convenience of explanation, the voltage level of 35KV is used for explanation. The corresponding voltage selection subunit includes a first sub-resistor R11, a second sub-resistor R12 and a PNP sub-transistor Q11. If, according to the instructions of relevant personnel, the corresponding port of the MCU is controlled to send a voltage selection signal to select a voltage of 35KV, the MCU will provide an enable EN 35KV. When the sensing terminal AJW1 senses the corresponding voltage, Q11 is turned on due to the pressure difference. After being turned on, the near-electric output module outputs the corresponding signal.

[0071] Further, the near-electric output module 3 includes an operational amplifier;

[0072] The sensing end of the operational amplifier is connected to the external signal source AJW1 to be measured, the reference voltage end of the operational amplifier UJ1 is connected to the potential adjustment end, the power supply end of the operational amplifier UJ1 is connected to the drain of the first transistor M1, and the output end of the operational amplifier UJ1 is connected to the alarm trigger end.

[0073] Specifically, when the voltage selection subunit in the voltage selection module 2 is turned on, if the signal source to be tested detects a signal input, the signal is transmitted from the signal source to be tested AJW1 and the corresponding PNP sub-transistor to the ground. After the sensing end and the reference voltage end of the operational amplifier UJ1 sample the signal, a high-level signal, i.e., an alarm trigger signal, will be output through the output end.

[0074] Furthermore, the near-electric output module 3 further includes a first capacitor C1; the first capacitor C1 is connected to the connection point between the operational amplifier UJ1 and the signal source AJW1 to be measured.

[0075] Specifically, the capacitor has a ripple characteristic and can be connected in parallel to a signal transmission path to effectively filter out interference signals, avoid misjudgment caused by interference signals, and improve circuit reliability.

[0076] Further, the alarm trigger module includes a first alarm BL1, a second transistor Q2, and a third resistor R3;

[0077] One end of the first alarm BL1 is connected to the drain of the first transistor M1, and the other end is connected to the collector of the second transistor Q2. The base of the second transistor Q2 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the output end of the operational amplifier UJ1.

[0078] The emitter of the second transistor Q2 is grounded.

[0079] Specifically, after receiving the alarm trigger signal output by the operational amplifier, the second transistor is turned on, and VCC2 can reach the ground through the first transistor, the first alarm, and the second transistor, thereby triggering the first alarm. The first alarm can be an alarm device such as a buzzer, an indicator light, etc. for prompting relevant personnel.

[0080] Furthermore, the alarm trigger module also includes a third transistor Q3, a fourth resistor R4, and a fifth resistor R5;

[0081] The base of the third transistor Q3 is connected to the connection point of the second transistor Q2 and the third resistor R3;

[0082] The collector of the third transistor Q3 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the Bluetooth signal source BLE;

[0083] The emitter of the third transistor Q3 is grounded, the connection between the third transistor Q3 and the fourth resistor R4 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to the alarm signal detection end of the MCU.

[0084] Specifically, the signal output by the operational amplifier UJ1 can also trigger the gate of the third transistor, thereby turning on the third transistor. The signal output by the Bluetooth signal source reaches the ground through the third transistor, thereby changing the pulse output to the MCU, that is, MCU JC. After receiving the pulse change, the MCU can combine Bluetooth and other methods to provide an alarm prompt, thereby realizing flexible and diverse alarm methods.

[0085] A second aspect of the present application provides a proximity alarm device equipped with the proximity alarm circuit described above. The proximity alarm device may be a proximity alarm.

[0086] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0087] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0088] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A near-electricity alarm circuit, Features: It includes a detection start module, a voltage level selection module, a near-electricity output module and an alarm trigger module; The detection start module includes a start control terminal, a power supply receiving terminal and a power supply output terminal, the voltage level selection module includes a potential selection terminal and a potential adjustment terminal, the near-electric output module includes a signal sensing terminal to be tested, a reference potential terminal, a first power supply terminal and a determination output terminal, and the alarm trigger module includes a second power supply terminal and an alarm trigger terminal; The detection start module is used to control the power supply of the near-electric output module and the alarm trigger module, and includes a first switch component and a second switch component. The start control end is used to receive a DC signal sent by an external MCU to control the on and off of the second switch component. The power supply receiving end is connected to an external DC signal source and is used to output a DC power supply signal to the first power supply end and the second power supply end when the second switch component is turned on. The voltage level selection module includes a plurality of voltage selection subunits, one of the voltage selection subunits corresponds to an enabling voltage level, and is used to determine a corresponding voltage selection subunit to be turned on according to the enabling voltage level, the potential selection terminal is used to receive a voltage level adjustment signal sent by the MCU, and turn on the corresponding voltage selection subunit according to the voltage level adjustment signal to start the near-electric output module, and the potential adjustment terminal is connected to the reference potential terminal; The signal-to-be-tested sensing end is used to receive an external signal to be tested, and determine the input potential of the signal-to-be-tested sensing end according to the signal to be tested, and the near-electric output module is used to output an alarm triggering DC signal to the alarm triggering end according to the input potential and the reference potential; The alarm trigger module includes an alarm device and a third switch device, which is used to control the on and off of the third switch device according to the alarm trigger DC signal. When the third switch device is turned on, the output DC power supply signal is output to the ground through the alarm device.

2. The proximity alarm circuit according to claim 1, Features: The detection start module includes a first triode, a first resistor, a second resistor, and a first transistor; The base of the first transistor is connected to one end of the first resistor, and the other end of the first resistor is connected to the MCU, so as to receive a DC signal sent by the MCU; The connection point between the first resistor and the first transistor is connected to one end of the second resistor, and the other end of the second resistor is grounded; The emitter of the first transistor is grounded, the collector is connected to an external first DC signal source, the first DC signal source is also connected to the gate of the first transistor, the source of the first transistor is connected to an external second DC signal source, and the drain of the first transistor is connected to the first power supply terminal and the second power supply terminal.

3. The proximity alarm circuit according to claim 2, Features: The voltage selection subunit includes a PNP sub-transistor, a first sub-resistor, and a second sub-resistor; The base of the PNP sub-transistor is connected to one end of the first sub-resistor, and the other end of the first sub-resistor is connected to an external Bluetooth signal source; The connection point between the first sub-resistor and the PNP sub-transistor is correspondingly connected to the voltage selection terminal of the MCU; The emitter of the PNP sub-transistor is connected to one end of the second sub-resistor, the other end of the second sub-resistor is connected to the reference potential end, and the collector of the PNP sub-transistor is grounded.

4. The proximity alarm circuit according to claim 3, Features: The near-electric output module includes an operational amplifier; The sensing end of the operational amplifier is connected to an external signal source to be measured, the reference voltage end of the operational amplifier is connected to the potential adjustment end, the power supply end of the operational amplifier is connected to the drain of the first transistor, and the output end of the operational amplifier is connected to the alarm trigger end.

5. The proximity alarm circuit according to claim 4, Features: The near-electric output module further includes a first capacitor; the first capacitor is connected to the connection point between the operational amplifier and the signal source to be tested.

6. The proximity alarm circuit according to claim 4, Features: The alarm trigger module includes a first alarm, a second triode, and a third resistor; One end of the first alarm is connected to the drain of the first transistor, and the other end is connected to the collector of the second triode, the base of the second triode is connected to one end of the third resistor, and the other end of the third resistor is connected to the output end of the operational amplifier; The emitter of the second transistor is grounded.

7. The proximity alarm circuit according to claim 6, Features: The alarm trigger module also includes a third triode, a fourth resistor, and a fifth resistor; The base of the third transistor is connected to the connection point of the second transistor and the third resistor; The collector of the third transistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the Bluetooth signal source; The emitter of the third transistor is grounded, the connection between the third transistor and the fourth resistor is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the alarm signal detection end of the MCU.

8. A near-electricity alarm device, Features: The device is equipped with a proximity alarm circuit as described in any one of claims 1 to 7.

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