CN205049645U - Protection circuit of test pencil - Google Patents
Protection circuit of test pencil Download PDFInfo
- Publication number
- CN205049645U CN205049645U CN201520624404.8U CN201520624404U CN205049645U CN 205049645 U CN205049645 U CN 205049645U CN 201520624404 U CN201520624404 U CN 201520624404U CN 205049645 U CN205049645 U CN 205049645U
- Authority
- CN
- China
- Prior art keywords
- test pencil
- circuit
- relay
- detection circuit
- microcontroller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses a protection circuit of test pencil, including the neon tube, still include power, current detection circuit, voltage detection circuit, microcontroller, relay and display element, microcontroller passes through the wire and is connected with power, current detection circuit, voltage detection circuit, relay and display element electricity respectively, and the relay is connected with the neon tube electricity. The utility model discloses a current detection circuit measuring current's size, voltage detection circuit detection voltage's size to demonstrating the numerical value of electric current and voltage through display element, being provided with the relay simultaneously in the circuit, when the electric current is too big, the relay can break off immediately, prevents because of the great damage test pencil of electric current, prolongs the life of test pencil. The utility model discloses safe and reliable is used in simple structure, easily manufacturing.
Description
Technical field
The protection circuit of the utility model specifically a kind of test pencil, belongs to electrician tool technical field.
Background technology
Test pencil is also test pencil, is called for short " electroprobe ".Be a kind of electrician tool, whether be chargedly used in test wires.There is a neon bulb in existing test pencil handwriting, if neon bulb is luminous during test, illustrate that wire has electricity or the live wire for path.Nib in test pencil, a tail, make for metal material, penholder is that insulating material is made.When using test pencil, the metallic member of test pencil tail end must be touched with hand, otherwise because electrified body, test pencil, human body and the earth do not form loop, the neon bulb in test pencil can not be luminous, causes erroneous judgement, think that electrified body is not charged.
But existing test pencil is without any protection circuit; when the electric current measured is excessive; can test pencil be directly caused to damage; when meat voltage is excessive; then easily shorten the serviceable life of test pencil; thus add use cost, therefore how effectively to protect the circuit in test pencil to become the technical matters being badly in need of at present solving.
Utility model content
In order to overcome above-mentioned defect, the utility model provides a kind of protection circuit of test pencil, can protect test pencil preferably, avoids test pencil damaged when electric current is excessive, extends the serviceable life of test pencil simultaneously.
The technical scheme that the utility model is adopted for achieving the above object is: a kind of protection circuit of test pencil; comprise neon bulb; also comprise power supply, current detection circuit, voltage detecting circuit, microcontroller, relay and display unit; described microcontroller is electrically connected with power supply, current detection circuit, voltage detecting circuit, relay and display unit respectively by wire, and relay is electrically connected with neon bulb.
Further, also comprise warning circuit, warning circuit is electrically connected with microcontroller.
Preferably, warning circuit comprises hummer and LED warning lamp, and hummer and LED warning lamp are electrically connected by wire.
Preferably, display unit is display screen.
Preferably, power supply is electronics or battery.
The utility model adopts current detection circuit to detect the size of electric current, voltage detecting circuit detects the size of voltage, and the numerical value of electric current and voltage is demonstrated by display unit, in circuit, be provided with relay simultaneously, when current is excessive, relay can disconnect immediately, prevents because electric current is comparatively large and damages test pencil, extending the serviceable life of test pencil.The utility model structure is simple, be easy to manufacture, and uses safe and reliable.
Accompanying drawing explanation
Fig. 1 is the utility model one-piece construction schematic diagram.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail.
As described in Figure 1; the protection circuit of a kind of test pencil of the utility model; primarily of neon bulb, power supply, current detection circuit, voltage detecting circuit, microcontroller, relay and display unit; described microcontroller is electrically connected with power supply, current detection circuit, voltage detecting circuit, relay and display unit respectively by wire, and relay is electrically connected with neon bulb.
As the improvement of the utility model to technique scheme, be also provided with warning circuit, described warning circuit is electrically connected with microcontroller, when the curtage detected is excessive, microcontroller will start warning circuit, reminds staff in time, and curtage is excessive.
As the optimal way of the utility model to technique scheme, described warning circuit comprises hummer and LED warning lamp, and hummer and LED warning lamp are electrically connected by wire, and alarming effect is better.
Have optimal way as the utility model to the another of technique scheme, described display unit is display screen, for showing the numerical value of the curtage of detection, for staff's reference.
Have optimal way as the utility model to another of technique scheme, described power supply is electronics or battery, and compact, is easy to carry.
During work, test pencil one end is inserted in socket by staff, the metallic member of test pencil tail end is touched again with hand, thus make test pencil connect circuit, current detection circuit and voltage detecting circuit detect electric current by test pencil and voltage, and data are sent to microcontroller, after microcontroller carries out treatment and analysis to data, be sent to display unit numerical value is shown, if the curtage detected is excessive, microcontroller will start warning circuit, timely prompting staff's electric current and voltage excessive, relay disconnects simultaneously, neon bulb does not work, prevent circuit from being burnt.If electric current and voltage are normally, then the neon bulb in test pencil is lighted.
Claims (5)
1. the protection circuit of a test pencil; comprise neon bulb; it is characterized in that; also comprise power supply, current detection circuit, voltage detecting circuit, microcontroller, relay and display unit; described microcontroller is electrically connected with power supply, current detection circuit, voltage detecting circuit, relay and display unit respectively by wire, and relay is electrically connected with neon bulb.
2. the protection circuit of a kind of test pencil according to claim 1, is characterized in that, also comprise warning circuit, and described warning circuit is electrically connected with microcontroller.
3. the protection circuit of a kind of test pencil according to claim 2, is characterized in that, described warning circuit comprises hummer and LED warning lamp, and hummer and LED warning lamp are electrically connected by wire.
4. the protection circuit of a kind of test pencil according to claim 3, is characterized in that, described display unit is display screen.
5. the protection circuit of a kind of test pencil according to claim 3, is characterized in that, described power supply is electronics or battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520624404.8U CN205049645U (en) | 2015-08-18 | 2015-08-18 | Protection circuit of test pencil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520624404.8U CN205049645U (en) | 2015-08-18 | 2015-08-18 | Protection circuit of test pencil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205049645U true CN205049645U (en) | 2016-02-24 |
Family
ID=55343214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520624404.8U Expired - Fee Related CN205049645U (en) | 2015-08-18 | 2015-08-18 | Protection circuit of test pencil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205049645U (en) |
-
2015
- 2015-08-18 CN CN201520624404.8U patent/CN205049645U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160224 Termination date: 20160818 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |