CN108828285A - Automatic alarm device and multimeter - Google Patents

Abstract

The present invention relates to electric measurement security technology areas, and in particular to a kind of automatic alarm device and multimeter, wherein automatic alarm device includes the signal processing module, microprocessor and alarm module being sequentially connected electrically；Microprocessor generates driving signal for controlling signal processing module；Signal processing module is used to detect whether the protective tube fuses to obtain testing result according to driving signal, and will test result and be sent to microprocessor；Microprocessor is also used to the control alarm module alarm when testing result is protective tube fusing.Automatic alarm device and multimeter provided by the invention improve user and do not know protective tube fusing and continue to use multimeter and carry out the problem of electric measurement is easy to happen safety accident.

Description

Automatic alarm device and multimeter

technical field

The invention relates to the technical field of electrical measurement safety, in particular to an automatic alarm device and a multimeter.

Background technique

With the frequent occurrence of electricity accidents, people pay more and more attention to the safe use of electricity, and the safety of electrical measurement is an indispensable part of safe use of electricity.

Multimeters are widely used in electrical measurement. Due to some misoperations during use, the fuse in the multimeter is often blown. Users who do not know that the fuse is blown and continue to use the multimeter for electrical measurement are prone to safety accidents.

Contents of the invention

In view of this, the purpose of the embodiments of the present invention is to provide an automatic alarm device and a multimeter, so as to improve the above-mentioned problem that the user continues to use the multimeter for electrical measurement without knowing that the fuse is blown, which is prone to safety accidents.

The embodiment of the present invention provides an automatic alarm device, which is applied to a multimeter and used to detect the safety tube inside the multimeter. The automatic alarm device includes a signal processing module, a microprocessor, and an alarm module that are electrically connected in sequence; The microprocessor is used to control the signal processing module to generate a driving signal; the signal processing module is used to detect whether the fuse is blown according to the driving signal to obtain a detection result, and send the detection result to the microprocessor. Processor; the microprocessor is also used to control the alarm module to alarm when the detection result is that the fuse is blown.

Further, the automatic alarm device also includes a signal input terminal, and the signal input terminal is electrically connected to the signal processing module and the fuse.

Further, the multimeter further includes a COM input terminal, and the signal input terminal is set at the COM input terminal of the multimeter.

Further, the signal processing module includes a comparator and a driving circuit, the comparator is electrically connected to the driving circuit, the comparator and the driving circuit are both electrically connected to the microprocessor, the comparator, the driving circuit The circuits are all electrically connected to the signal input end; the drive circuit is used to generate the drive signal under the control of the microprocessor and send it to the signal input end so that the signal input end generates a feedback signal and sent to the comparator, and is also used to generate the driving signal under the control of the microprocessor and send it to the comparator; the comparator is used to obtain the detection result according to the driving signal and the feedback signal , and send the detection result to the microprocessor.

Further, the comparator includes a first input terminal, a second input terminal and an output terminal, the first input terminal is electrically connected to the signal input terminal, the second input terminal is electrically connected to the driving circuit, The output terminal is electrically connected with the microprocessor.

Further, the alarm module includes at least one of a display screen, a buzzer, an alarm light and a vibrator.

Further, the automatic alarm device further includes a power module, and the power module is electrically connected to the signal processing module, the microprocessor and the alarm module.

Further, the power module includes at least one of a power adapter and a rechargeable battery.

A multimeter, comprising the above-mentioned automatic alarm device, the automatic alarm device comprising a signal processing module, a microprocessor and an alarm module electrically connected in sequence; the microprocessor is used to control the signal processing module to generate a drive signal; the The signal processing module is used to detect whether the fuse is blown according to the driving signal to obtain a detection result, and send the detection result to the microprocessor; the microprocessor is also used to obtain the detection result when the detection result is the When the fuse is blown, the alarm module is controlled to give an alarm. The multimeter also includes a fuse, and the fuse is electrically connected to the automatic alarm device.

Further, the multimeter also includes a COM input terminal, and the fuse is arranged at the COM input terminal.

Compared with the prior art, the present invention has the following beneficial effects:

An automatic alarm device and a multimeter provided by the present invention use a signal processing module to detect whether the fuse is blown to obtain a detection result, and send the detection result to a microprocessor. When the detection result is that the fuse is blown, the microprocessor controls the alarm The alarm is used to inform the user that the fuse of the multimeter has been blown, so as to improve the problem that the user does not know that the fuse is blown and continues to use the multimeter for electrical measurement, which is prone to safety accidents.

In order to make the above-mentioned objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 shows a schematic block diagram of an automatic alarm device provided by an embodiment of the present invention.

Fig. 2 shows a schematic structural diagram of a multimeter provided by an embodiment of the present invention.

Fig. 3 shows a schematic block diagram of the automatic alarm device provided by the embodiment of the present invention.

Fig. 4 shows a schematic block diagram of a multimeter provided by an embodiment of the present invention.

Icons: 10-multimeter; 100-automatic alarm device; 110-microprocessor; 120-signal processing module; 121-drive circuit; 122-comparator; 130-signal input terminal; 140-alarm module; 150-power supply module; 200-fuse tube; 300-COM input terminal.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner" and "outer" are based on the Orientation or positional relationship, or the orientation or positional relationship that the inventive product is usually placed in use, is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, so as to Specific orientation configurations and operations, therefore, are not to be construed as limitations on the invention.

In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.

In the description of the present invention, it should also be explained that in this article, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and not necessarily No such actual relationship or order between these entities or operations is required or implied. The terms "horizontal", "vertical", "overhanging" and the like do not imply that the part is absolutely level or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined. The term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements but also other elements not expressly listed elements, or also elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Some embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

first embodiment

Please refer to FIG. 1 and FIG. 2 in conjunction. The present embodiment provides an automatic alarm device 100, which is applied to the multimeter 10 and is used to detect the fuse 200 inside the multimeter 10. The multimeter 10 also includes 4 input terminals, which are respectively VΩ input terminal, COM input terminal 300, mA input terminal, 10A terminal input terminal. When the multimeter 10 performs electrical measurement, it is necessary to selectively connect to the input terminal of the multimeter 10 . Automatic alarm device 100 comprises microprocessor 110, signal processing module 120, signal input terminal 130, alarm module 140 and power module 150, and signal processing module 120, alarm module 140 and power module 150 are all electrically connected with microprocessor 110, microprocessor The processor 110, the signal processing module 120 and the alarm module 140 are all electrically connected to the power module 150, the signal input terminal 130 is electrically connected to the fuse 200, and the power module 150 is used to provide power to the microprocessor 110, the signal processing module 120 and the alarm module 140. Provide electricity supply.

In the embodiment of the present invention, the microprocessor 110 is electrically connected to the signal processing module 120, and is used to control the signal processing module 120 to generate a driving signal. The drive signal can be a voltage or a current. The microprocessor 110 can control the signal processing module 120 to generate the driving signal by sending a control command to the signal processing module 120 .

As an implementation manner, the microprocessor 110 may be an integrated circuit chip with signal processing capabilities, and the microprocessor 110 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc., can also be digital signal processors, application-specific integrated circuits, field programmable gate arrays or other programmable logic devices, discrete gate or transistor logic devices, and discrete hardware components.

Please refer to Fig. 3, in the embodiment of the present invention, the signal processing module 120 is electrically connected with the microprocessor 110 and the signal input terminal 130, and is used to detect whether the fuse 200 is blown according to the driving signal to obtain the detection result, and send the detection result to the microprocessor 110 . Signal processing module 120 comprises driving circuit 121 and comparator 122, and driving circuit 121 is electrically connected with comparator 122, and driving circuit 121, comparator 122 are all electrically connected with microprocessor 110, and driving circuit 121, comparator 122 are all connected with signal input. Terminal 130 is electrically connected.

The drive circuit 121 is electrically connected to the comparator 122, the microprocessor 110 and the signal input terminal 130, and is used to generate a drive signal under the control of the microprocessor 110 and send it to the signal input terminal 130 so that the signal input terminal 130 generates a feedback signal and sent to the comparator 122 , and is also used to generate a driving signal under the control of the microprocessor 110 and sent to the comparator 122 . The feedback signal may be a voltage or a current corresponding to the driving signal. It can be understood that when the driving signal is a voltage, the feedback signal is also a voltage; when the driving signal is a current, the feedback signal is also a current. Optionally, the drive circuit 121 may be a simple amplifier circuit, which obtains a drive signal by amplifying the control command sent by the microprocessor 110, and sends the drive signal to the signal input terminal 130 so that the signal input terminal 130 generates feedback The signal is sent to the comparator 122, and is also used to send the drive signal to the comparator 122.

The comparator 122 is electrically connected to the driving circuit 121 , the microprocessor 110 and the signal input terminal 130 , and is used to obtain the detection result according to the driving signal and the feedback signal, and send the detection result to the microprocessor 110 . The comparator 122 may be, but is not limited to, a zero-crossing voltage comparator, a voltage comparator, a window comparator, a hysteretic comparator, and the like. The comparator 122 includes a first input terminal, a second input terminal and an output terminal. The first input terminal is electrically connected to the signal input terminal 130 , the second input terminal is electrically connected to the driving circuit 121 , and the output terminal is electrically connected to the microprocessor 110 . The first input end of comparator 122 is electrically connected with signal input end 130, is used for receiving the feedback signal that signal input end 130 generates; The second input end of comparator 122 is electrically connected with drive circuit 121, is used for receiving drive circuit 121 to send The driving signal of the comparator 122 is electrically connected to the microprocessor 110 for sending the generated detection result to the microprocessor 110 . The comparator 122 compares the feedback signal with the driving signal, and outputs a detection result. For example, if the detection result is 1, it is considered that the fuse 200 is blown, and if the detection result is 0, it is considered that the fuse 200 is not blown. The driving signal 5V and the feedback signal 0V, and the detection result 1 is obtained, then it can be understood that the fuse 200 is blown, and the detection result 1 is sent to the microprocessor 110 . Specifically, the comparator 122 can be LM324, LM358, LM339, LM393, UA741 and so on.

In the embodiment of the present invention, the signal input terminal 130 is electrically connected to the drive circuit 121 of the signal processing module 120, the comparator 122, and the fuse 200 of the multimeter 10, and is used to generate a feedback signal when the drive circuit 121 sends a drive signal and sent to comparator 122. The signal input terminal 130 is set at the COM input terminal 300 of the multimeter 10 . Optionally, the signal input end 130 may be electrically connected to both ends of the fuse 200 . The signal input terminal 130 receives the drive signal from the drive circuit 121 and sends the drive signal to one end of the fuse 200, the drive signal is input from one end of the fuse 200, and the signal output from the other end of the fuse 200 is feedback. signal, the signal input terminal 130 sends the feedback signal to the comparator 122 .

In the embodiment of the present invention, the alarm module 140 is electrically connected to the microprocessor 110, and is used to issue an alarm under the control of the microcontroller when the detection result received by the microprocessor 110 is that the fuse 200 is blown. The alarm module 140 may include at least one of a display screen, a buzzer, an alarm light and a vibrator. It can be understood that the alarm module 140 can be a display screen and a buzzer, or an audible and visual alarm integrating a buzzer and a warning light, or a vibrator and a warning light. Optionally, the alarm module 140 can select a display screen and a buzzer, and both the display screen and the buzzer are electrically connected to the microprocessor 110. When the detection result received by the microprocessor 110 is that the fuse 200 is blown, the microprocessor The device 110 is also used to control the opening of the display screen and the buzzer. At this time, the display screen can display the symbol "!", and the buzzer sends out a safe voice prompt of "There is a danger of electricity, please replace the fuse in time" to remind the user that the The fuse 200 of the multimeter 10 is blown, which prevents the user from knowing that the fuse 200 is blown and continues to use the multimeter 10 for electrical measurement, which is prone to safety accidents.

In other embodiments of the present invention, the alarm module 140 may use a vibrator and an alarm light. Both the vibrator and the alarm lamp are electrically connected to the microprocessor 110. When the detection result received by the microprocessor 110 is that the fuse 200 is blown, the microprocessor 110 controls the vibrator to be turned on, the alarm lamp is on, and the vibrator emits a high-frequency micro-amplitude. Vibration will produce a feeling similar to electric shock, and provide tactile reminders to users who continue to use the multimeter 10 with the fuse 200 blown. 10 The prompt message that the fuse 200 has been blown.

In the embodiment of the present invention, the power supply module 150 is electrically connected to the microprocessor 110, the signal processing module 120, and the alarm module 140, and the power supply module 150 is used to provide power to the microprocessor 110, the signal processing module 120 and the alarm module 140 supply. The power module 150 may be at least one of a power adapter and a rechargeable battery.

As an implementation, the power supply module 150 can be a power adapter, the power adapter is electrically connected to the microprocessor 110, the signal processing module 120 and the alarm module 140, and the power adapter converts the 220V AC household electricity into a power supply for the microprocessor. 110 . The DC power supply of the signal processing module 120 and the alarm module 140 .

The working principle of the automatic alarm device 100 provided by the embodiment of the present invention: the microprocessor 110 sends a control instruction to the drive circuit 121 of the signal processing module 120 so that the drive circuit 121 generates a drive signal, and the drive circuit 121 sends the drive signal to the signal Input terminal 130 and comparator 122, drive signal generates feedback signal through signal input terminal 130 and sends to comparator 122, comparator 122 compares described drive signal and feedback signal to obtain detection result, microprocessor 110 is also used for when detection result When the fuse 200 is blown, the alarm module 140 is controlled to give an alarm.

second embodiment

The multimeter 10 provided by the embodiment of the present invention has the same basic structure, principle and technical effect as that of the first embodiment. For a brief description, the part not mentioned in this embodiment can refer to the corresponding content in the first embodiment. .

Please refer to FIG. 4 , the multimeter 10 includes a fuse 200 , an automatic alarm device 100 and 4 input terminals. The 4 input terminals are VΩ input terminal, COM input terminal 300 , mA input terminal, and 10A input terminal. When the multimeter 10 performs electrical measurement, it is necessary to selectively connect to the input terminal of the multimeter 10 . The fuse 200 is electrically connected to the automatic alarm device 100 , and the input signal end 130 of the fuse 200 and the automatic alarm device 100 can be set at the COM input end 300 .

In summary, the embodiment of the present invention provides an automatic alarm device and a multimeter. The automatic alarm device includes a signal input terminal, a signal processing module, a microprocessor and an alarm circuit electrically connected in sequence, and the microprocessor sends control instructions to the signal processing unit. The drive circuit of the module enables the drive circuit to generate a drive signal, the drive circuit sends the drive signal to the signal input terminal and the comparator, the drive signal generates a feedback signal through the signal input terminal and sends it to the comparator, and the comparator compares the drive signal and the feedback signal to obtain the detection result, and the microprocessor is also used to control the alarm module to give an alarm when the detection result is that the fuse is blown. The invention can realize the detection of the fuse inside the multimeter, and when the fuse is detected to be blown, an alarm will be given to remind the user of the multimeter in time, preventing the user from continuing to use the multimeter for electrical measurement without knowing that the fuse is blown. Situations of security incidents.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a kind of automatic alarm device, which is characterized in that be applied to multimeter, for the protective tube inside the multimeter into Row detection, the automatic alarm device includes the signal processing module, microprocessor and alarm module being sequentially connected electrically；

The microprocessor generates driving signal for controlling the signal processing module；

The signal processing module is used to detect whether the protective tube fuses to obtain testing result according to the driving signal, and The testing result is sent to the microprocessor；

The microprocessor is also used to control the alarm module alarm when the testing result is protective tube fusing.

2. automatic alarm device as described in claim 1, which is characterized in that the automatic alarm device further includes signal input End, the signal input part are electrically connected with the signal processing module, protective tube.

3. automatic alarm device as claimed in claim 2, which is characterized in that the multimeter further includes COM input terminal, described Signal input part is set to the COM input terminal of the multimeter.

4. automatic alarm device as claimed in claim 2, which is characterized in that the signal processing module includes comparator and drive Dynamic circuit, the comparator are electrically connected with the driving circuit, and the comparator, driving circuit are electrically connected with the microprocessor It connects, the comparator, driving circuit are electrically connected with the signal input part；

The driving circuit under the control of the microprocessor for generating the driving signal and to be sent to the signal defeated Enter to hold so that the signal input part, which generates, feedback signal and is sent to the comparator, is also used to the control in the microprocessor System is lower to be generated the driving signal and is sent to the comparator；

The comparator is used to obtain testing result according to the driving signal and the feedback signal, and by the testing result It is sent to the microprocessor.

5. automatic alarm device as claimed in claim 4, which is characterized in that the comparator includes first input end, second Input terminal and output end, the first input end are electrically connected with the signal input part, second input terminal and the driving Circuit electrical connection, the output end are electrically connected with the microprocessor.

6. automatic alarm device as described in claim 1, which is characterized in that the alarm module include display screen, buzzer, At least one of alarm lamp and vibrator.

7. automatic alarm device as described in claim 1, which is characterized in that the automatic alarm device further includes power supply mould Block, the power module are electrically connected with the signal processing module, microprocessor and alarm module.

8. automatic alarm device as claimed in claim 7, which is characterized in that the power module includes power supply adaptor and fills At least one of battery.

9. a kind of multimeter, which is characterized in that including the described in any item automatic alarm devices of claim 1-8, the general-purpose Table further includes protective tube, and the protective tube is electrically connected with the automatic alarm device.

10. multimeter as claimed in claim 9, which is characterized in that the multimeter further includes COM input terminal, the insurance Pipe is set to the COM input terminal.