CN2677945Y - Nondistructive short-circuit detector - Google Patents
Nondistructive short-circuit detector Download PDFInfo
- Publication number
- CN2677945Y CN2677945Y CN 03210578 CN03210578U CN2677945Y CN 2677945 Y CN2677945 Y CN 2677945Y CN 03210578 CN03210578 CN 03210578 CN 03210578 U CN03210578 U CN 03210578U CN 2677945 Y CN2677945 Y CN 2677945Y
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- circuit
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- signal
- detector
- magnetoelectric transducer
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model provides a nondistructive short-circuit detector that can quickly and accurately detect the short-circuit fault of the electric appliances in a nondestructive mode, even if the appliances are unable to be normally opened. The nondistructive short-circuit detector comprises an electrical signal generating circuit that can be connected between two endpoints of the circuit that is detected and provides the current signals for the circuit between the two endpoints, a magnetoelectric transducer that converts the magnetic field signals to the electrical signals, an amplifying circuit that is connected with the output end of the magnetoelectric transducer and amplifies and processes the electrical signals output by the magnetoelectric transducer, and an indicating unit that is connected with the output end of the amplifying circuit and is driven by the output signals of the amplifying circuit to detect the magnetic field signals or indicate the signal intensity of the magnetic field.
Description
Technical field
The utility model relates to electrical measuring device, the detector of particularly a kind of testing circuit electric leakage, short circuit.
Background technology
For the short trouble of electrical equipment, general how searching by the voltage between measuring circuit, resistance or working current, measuring equipment commonly used comprises voltage table, ohmmeter and multimeter etc.The shortcoming of these measuring methods is usually to need to take apart circuit inspection, and the time of cost is longer, and easily electric wiring and components and parts is caused damage.
For the measurement of electric current, also can adopt undamaged clamp on amperemeter.But this device is not suitable for the intensive occasion of circuit, and intensive printed-wiring board (PWB) particularly connects up.In addition, fault often can't power on by normal boot-strap after taking place, and this has also limited the application of clamp on amperemeter.
Summary of the invention
The purpose of this utility model provides a kind of harmless short-circuit detector, and it can detect the electric short circuit fault with lossless manner quickly and accurately, even can't power on by normal boot-strap.
Goal of the invention of the present utility model is achieved through the following technical solutions:
A kind of harmless short-circuit detector comprises:
Electrical signal generating circuit, it can be connected between two end points of detected circuit and provide current signal with the circuit between described end points;
Magnetoelectric transducer, it is converted to electric signal with field signal;
With the amplifying circuit that described magnetoelectric transducer output terminal links to each other, its electric signal to magnetoelectric transducer output carries out processing and amplifying;
With the indicating member that the output terminal of described amplifying circuit links to each other, it is indicated under the driving of amplifying circuit output signal and detects field signal or indication field signal intensity.
Reasonablely be, in above-mentioned harmless short-circuit detector, described current signal is an ac current signal, and its frequency is 1kHz, and strength of current is 10～50 milliamperes.
Reasonable is that in above-mentioned harmless short-circuit detector, the waveform of described ac current signal is square wave or sine wave.
Reasonable is that in above-mentioned harmless short-circuit detector, described magnetoelectric transducer is a magnetic head.
Reasonable is that in above-mentioned harmless short-circuit detector, described amplifying circuit is made up of linear operational amplifier and auxiliary circuit.
Reasonablely be that in above-mentioned harmless short-circuit detector, described indicating member is a kind of in earphone, hummer and the loudspeaker.
Therefore harmless short-circuit detector of the present utility model provides ac current signal by the ac current signal source to tested circuit, need not start and powers on and can finish detection.In addition, the connecting terminal between the volume of magnetoelectric transducer and signal source and the tested circuit can be done lessly, and this short trouble that makes this harmless short-circuit detector be particularly suitable for printed circuit board (PCB) class electrical equipment detects.
Description of drawings
By below in conjunction with the description of accompanying drawing to preferred embodiment of the present invention, can further understand the purpose of this utility model, feature and advantage, wherein:
Fig. 1 is the circuit theory diagrams according to harmless short-circuit detector of the present utility model.
Fig. 2 is the fundamental diagram according to harmless short-circuit detector of the present utility model.
Embodiment
Detection principle according to harmless short-circuit detector of the present utility model is, thereby by forming short-circuit loop to detected circuit injection current signal, will produce certain Distribution of Magnetic Field along the path of this short-circuit loop.When magnetoelectric transducer when the short-circuit loop, it is converted to electric signal with field signal and is amplified by amplifying circuit, under the driving of electric signal after the amplification, indicating member can send reports to the police indication or shows field signal intensity.The testing staff can be according to information such as short-circuit loop of determining and field signal intensity, finds location of short circuit in conjunction with the concrete structure of detected circuit.
In above-mentioned harmless short-circuit detector, can adopt various signal generating circuits to produce the current signal that injects, as long as can in detected electrical equipment, form short-circuit loop.For those skilled in that art, it is conspicuous how selecting appropriate signal generation circuit according to concrete applicable cases, therefore repeats no more herein.In addition, the current signal of injection can be an AC signal, also can be direct current signal, but since realize magnetoelectricity conversion and signal amplification to exchange device cost lower, so generally all adopt AC signal.In above-mentioned harmless short circuit detector, magnetoelectric transducer and amplifying circuit be there is no specific (special) requirements, as long as the sensitivity of magnetoelectric transducer is enough to detect the drive signal that the signal of field signal that injection current produces and amplifying circuit output can provide coupling for indicating member.Selection as for indicating member, it depends on the structure of concrete detected circuit, if only need indicate magnetoelectric transducer whether to detect field signal, then can adopt various acousto optic element device qualitative representation testing results such as earphone, hummer and loudspeaker, if the path more complicated of short-circuit loop, need to analyze the intensity of injection current in each path, then can adopt equipment quantificational expression testing results such as galvanometer, voltage table.Because these equipment all are that those skilled in that art know, therefore repeat no more herein.
Below by accompanying drawing preferred embodiment of the present utility model is described.
As shown in Figure 1, harmless short-circuit detector of the present utility model comprises electrical signal generating circuit 1, magnetic head 2, amplifying circuit 3 and earphone 4.It is 1KHz, intensity between 10～50 milliamperes probe current that electrical signal generating circuit 1 can be connected between two end points of detected circuit C1 with the circuit injected frequency between end points, and its waveform is square wave or sine wave.Magnetic head 2, amplifying circuit 3 and earphone 4 constitute the input part, wherein magnetic head 2 is converted to electric signal as magnetoelectric transducer with field signal, amplifying circuit 3 is made of linear operational amplifier and auxiliary circuit, its input end links to each other with the output terminal of magnetic head 2, the ultra-weak electronic signal of magnetic head 2 outputs is carried out processing and amplifying, earphone 4 links to each other as the output terminal of indicating member with amplifying circuit 3, issues out voice signal in the driving of amplifying circuit 3 output signals and detects field signal with the indication magnetic head.
Below by Fig. 2 the principle of work of above-mentioned harmless short-circuit detector is described.As shown in Figure 2, detected circuit is made up of device 5a～5d, and each device should be not conducting under normal condition.When the lead-out terminal of electrical signal generating circuit 1 was connected between the test line, short circuit device 5b made detected circuit and electrical signal generating circuit 1 constitute a loop C2.Current signals flowing will produce field signal M (among Fig. 2 with ellipse representation) along this loop in the loop.When magnetic head 2 close not short circuit device 5a, 5c or 5d, owing to there is not the injection current process, therefore can not bring out the generation electric signal in the magnetic head 2, when magnetic head 2 during near short circuit device 5b, to detect the field signal that electric current produced of flowing through in this device and be converted to electric signal, this electric signal amplifies rear drive earphone 4 through linear operational amplifier and sends chimes of doom, and the testing staff can determine device 5b short circuit.
Claims (6)
1. a harmless short-circuit detector is characterized in that, comprising:
Electrical signal generating circuit, it can be connected between two end points of detected circuit and provide current signal with the circuit between described end points;
Magnetoelectric transducer, it is converted to electric signal with field signal;
With the amplifying circuit that described magnetoelectric transducer output terminal links to each other, its electric signal to magnetoelectric transducer output carries out processing and amplifying;
With the indicating member that the output terminal of described amplifying circuit links to each other, it is indicated under the driving of amplifying circuit output signal and detects field signal or indication field signal intensity.
2. harmless short-circuit detector as claimed in claim 1 is characterized in that, described current signal is an ac current signal, and its frequency is 1kHz, and strength of current is 10～50 milliamperes.
3. harmless short-circuit detector as claimed in claim 2 is characterized in that, the waveform of described ac current signal is square wave or sine wave.
4. as any described harmless short-circuit detector in the claim 1～3, it is characterized in that described magnetoelectric transducer is a magnetic head.
5. harmless short-circuit detector as claimed in claim 4 is characterized in that described amplifying circuit is made up of linear operational amplifier and auxiliary circuit.
6. harmless short-circuit detector as claimed in claim 5 is characterized in that, described indicating member is a kind of in earphone, hummer and the loudspeaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03210578 CN2677945Y (en) | 2003-09-15 | 2003-09-15 | Nondistructive short-circuit detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03210578 CN2677945Y (en) | 2003-09-15 | 2003-09-15 | Nondistructive short-circuit detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2677945Y true CN2677945Y (en) | 2005-02-09 |
Family
ID=34580272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03210578 Expired - Fee Related CN2677945Y (en) | 2003-09-15 | 2003-09-15 | Nondistructive short-circuit detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2677945Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565610A (en) * | 2011-12-23 | 2012-07-11 | 西安奇维科技股份有限公司 | Short circuit detector based on electromagnetic induction principle and detection method of short circuit detector |
| CN103518141A (en) * | 2011-04-05 | 2014-01-15 | 萨甘安全防护公司 | Method and system for detecting a short-circuit affecting a sensor |
| CN110073562A (en) * | 2016-12-16 | 2019-07-30 | 伊顿智能动力有限公司 | Overcurrent and short-circuit detector |
-
2003
- 2003-09-15 CN CN 03210578 patent/CN2677945Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103518141A (en) * | 2011-04-05 | 2014-01-15 | 萨甘安全防护公司 | Method and system for detecting a short-circuit affecting a sensor |
| CN103518141B (en) * | 2011-04-05 | 2016-09-14 | 萨甘安全防护公司 | For detecting the method and system of the short circuit affecting sensor |
| CN102565610A (en) * | 2011-12-23 | 2012-07-11 | 西安奇维科技股份有限公司 | Short circuit detector based on electromagnetic induction principle and detection method of short circuit detector |
| CN110073562A (en) * | 2016-12-16 | 2019-07-30 | 伊顿智能动力有限公司 | Overcurrent and short-circuit detector |
| CN110073562B (en) * | 2016-12-16 | 2021-06-29 | 伊顿智能动力有限公司 | Overcurrent and short circuit detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050209 Termination date: 20091015 |