CN101191813A - Short circuit detection device - Google Patents
Short circuit detection device Download PDFInfo
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- CN101191813A CN101191813A CNA2007101127423A CN200710112742A CN101191813A CN 101191813 A CN101191813 A CN 101191813A CN A2007101127423 A CNA2007101127423 A CN A2007101127423A CN 200710112742 A CN200710112742 A CN 200710112742A CN 101191813 A CN101191813 A CN 101191813A
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Abstract
The invention provides a short circuit detecting device, comprising a DC power supply, a current-limiting resistor and at least one display unit, which are connected with one another serially, with each display unit in parallel connection with a short circuit detecting terminal, wherein the display unit is an LED. With the DC power supply and the current-limiting resistor, the short circuit detecting device can detect the short circuit between randomly selected signals to be detected and display the result, even if no current is available between the signals. The short circuit detecting device of the invention can be provided with a plurality of display units, so, according the actual need of the detection, the invention can detect short circuits between a plurality of pairs of signals to be detected.
Description
Technical field
The present invention relates to the electric circuit inspection technical field, relate in particular to a kind of short-circuit detecting device.
Background technology
In the electric circuit inspection technical field,, before device power, all need equipment or veneer are carried out short-circuit detecting for preventing that the veneer on equipment or the equipment from being burnt.
In the prior art, short-circuit detecting device has multiple, the method that realizes short-circuit detecting also has nothing in common with each other, for example, the patent that Chinese patent application number is 98106070.6, name is called short circuit detector, a kind of testing circuit is disclosed, this testing circuit by comparer, logical circuit etc. realize to signal and power supply, between short-circuit detecting, this testing circuit implementation method and principle more complicated, testing result be significantly indication not, and be only applicable to detection signal and power supply, between short circuit, be not suitable for the short-circuit detecting between arbitrary signal;
The patent that Chinese patent application number is 02157131.7, name is called open circuit/short circuit detector and detection method thereof, a kind of pick-up unit is disclosed, this pick-up unit is used for the open circuit/short circuit between testing circuit chip on board and the pin sockets thereof, restricted application, and need could realize under the situation that circuit board powers on that open circuit/short circuit detects the possibility that exists circuit board to be burnt;
Chinese patent application number is called the patent of short-circuit detecting circuit device for 200510006819.X, name, a kind of testing circuit is disclosed, this testing circuit passes through the short-circuit detecting of realizations such as signal generator, signal processor, self-diagnostic circuit to simulating signal, and can not be used for the detection to short circuit between digital signal;
Chinese patent application number is 98109793.6, name is called the method that detects short-circuit condition and adopt the patent of the device of this method, a kind of pick-up unit is disclosed, this device adopts the sampling to the load instantaneous electric current, realization is to the detection of short-circuit condition in the electrical network, what this device adopted is a kind of more accurate detection method, the method more complicated.
Summary of the invention
For this reason, technical matters to be solved by this invention is: a kind of short-circuit detecting device is provided, makes the detection of its combination in any short circuit between just can finishing measured signal under the situation that measured signal does not power on, the testing result indication is obvious, circuit is realized simple.
So, the invention provides a kind of short-circuit detecting device, comprising: the direct supply that is one another in series, current-limiting resistance and at least one display unit, each display unit is parallel with the short-circuit detecting terminal.
Wherein, described display unit is light emitting diode or DC ammeter.
Short-circuit detecting device of the present invention also comprises: signal converting unit, the signal converting parts of described signal converting unit for being connected with described every group of short-circuit detecting terminal.
Wherein, described signal converting parts are connector.
Perhaps, described signal converting parts are cable.
Perhaps, described signal converting parts are a sleeve clamp, and an end of these anchor clamps is convenient to be connected with measured signal, and the other end of these anchor clamps is connected with described short-circuit detecting terminal by cable is convenient.
Realization principle of the present invention is, if having short circuit between the measured signal, respective display unit is by short circuit so, by the display device of display unit, and for example demonstration of light emitting diode or DC ammeter, the position that can orient short trouble at an easy rate.
For this reason, short-circuit detecting device of the present invention is provided with direct supply, under the situation that measured signal does not power on, just can realize whether there being the detection of short circuit between tested arbitrary signal, and the testing result indication obviously.Because short-circuit detecting device of the present invention can be provided with a plurality of display units, therefore,, can finish the short-circuit detecting of many groups measured signal simultaneously again according to reality test needs.
Description of drawings
Fig. 1 is an embodiment of the invention short-circuit detecting device structural representation;
Fig. 2 is the circuit diagram of short-circuit detecting device embodiment one of the present invention;
Fig. 3 is the circuit diagram of short-circuit detecting device embodiment two of the present invention.
Embodiment
Below, describe the present invention in conjunction with the accompanying drawings.
As shown in Figure 1, embodiment of the invention short-circuit detecting device comprises: direct supply 11, current-limiting resistance R1, display unit 12 and signal converting unit 13.
In short-circuit detecting device of the present invention, can comprise a display unit 12, also can comprise a plurality of display units 12, with convenient a plurality of measured signals are detected simultaneously.After a plurality of display units 12 are one another in series, also be connected in series with direct supply, and draw the short-circuit detecting terminal from each tie point of series connection, each short-circuit detecting terminal is connected with signal converting unit 13.
Embodiment one
The realization principle of present embodiment is, if have short circuit between the measured signal, display unit 12 is by short circuit, by the display device of respective display unit so, the for example demonstration of light emitting diode or DC ammeter, the position that can orient short trouble at an easy rate.
Short-circuit detecting device of the present invention, the circuit diagram of embodiment one as shown in Figure 2,12 series limiting resistor R1 of direct supply 11 and display unit, present embodiment adopt three display units, are respectively:
One group of short-circuit detecting terminal in parallel on each group display unit 12, in the present embodiment on first group of display unit 12 one group of in parallel short-circuit detecting terminal be terminal a, terminal b, one group of short-circuit detecting terminal in parallel on second group of display unit 12 is terminal b, terminal c, one group of short-circuit detecting terminal in parallel on the 3rd display unit 12 is terminal c, terminal d, and terminal a, b, c, d are connected on the signal converting unit 13.
The direct supply 11 and first display unit, second display unit and the 3rd display unit are one another in series.
The selection principle of direct supply: 1, can provide enough drive current (generally to be designed to 5mA～10mA) for detecting light emitting diode on the loop; 2, because the forward conduction voltage of light emitting diode is generally 1.8V～2V, so direct supply voltage should light emitting diode quantity multiply by 2V on the loop greater than detecting, and the quantity that detects light emitting diode on the loop equals the quantity of measured signal and subtracts 1.Be exemplified below: if the measured signal number is 2, then detects the loop and comprise 1 light emitting diode, direct supply can be selected 5V; If the measured signal number is 3, then detect the loop and comprise 2 light emitting diodes, direct supply can be selected 9V; If the measured signal number is 4, then detect the loop and comprise 3 light emitting diodes, direct supply can be selected 12V.
The resistance of current-limiting resistance and the selection of power decide the principle of selection according to the direct supply that measured signal quantity and pick-up unit adopt: 1, the electric current by the detection loop should enough drive lumination of light emitting diode on the loop and (generally be designed to 5mA～10mA); If there is short circuit in 2 signal wires, loop current may all consume on current-limiting resistance, so the power of current-limiting resistance should be enough big.Be exemplified below: if the measured signal number is 2, direct supply is chosen as 5V, and current-limiting resistance can be selected 500 Ohmages (power is greater than 0.05W); If the measured signal number is 3, direct supply is chosen as 9V, and current-limiting resistance can be chosen as 1K Ohmage (power is greater than 0.081W); If the measured signal number is 4, direct supply is chosen as 12V, and current-limiting resistance can be chosen as 1K Ohmage (power is greater than 0.144W).
In the present embodiment, direct supply VCC is chosen as 12V, resistance R 1 is 1K Ω (power is greater than 0.144W), LED 1, LED2, LED3 adopt common light emitting diode, forward conduction voltage is about 2V, detection loop current before not carrying out short-circuit test is about 6mA, and LED 1, LED2, LED3 are luminous; If a display unit is arranged by short circuit in the circuit, circuital current is 8mA, can be normally not luminous by the light emitting diode of short circuit; If two display units are arranged by short circuit in the circuit, circuital current is 10mA, can be normally not luminous by the light emitting diode of short circuit.If three display units are all by short circuit, then power all consumes on current-limiting resistance R1, maximum 0.144W.
After signal converting unit 13 is guided to measured signal on this device, if all do not have short circuit between the combination in any of terminal a, b, c, four signal wires of d, LED 1, LED2, LED3 have electric current to pass through so, and these three lumination of light emitting diode are bright state;
If short circuit between terminal a, the b, there is not short circuit in other any two signal wires, and LED 1 is not worked by short circuit so, and LED 2 and LED3 are normally luminous, are bright state;
In like manner, can analyze between any two even the many signals if there is short circuit, light emitting diode bright with the state that does not work.
In a word, as long as have short circuit between the measured signal line, do not worked by short circuit with regard to having light emitting diode; When short circuit occurring between terminal a, the d, all light emitting diodes are all by short circuit, all do not work, at this moment, still can judge measured signal has short circuit to exist, and just is not easy to orient location of fault, therefore, when this kind situation occurs, can allocate the relative position of the position of measured signal entering signal adapter unit or allotment signal converting unit splicing ear a, b, c, d, still can accurately navigate to location of fault.
As seen, by the bright of light emitting diode with do not work, can accurately judge is to have short circuit between which two signal wire, it is fairly simple that circuit is realized, the testing result indication is obviously.
In the present embodiment, the measured signal of foregoing description can be any kind signal (comprising numeric class or simulation class signal), because in testing process, measured signal does not power up, whether just physically exist short circuit to detect to signal wire, what can not consider that signal wire powers up back operation is the signal of what type.
Embodiment two
As shown in Figure 3, the circuit of present embodiment realizes that principle is identical with embodiment one, no longer be repeated in this description at this, different is: at display unit 12, LED 1, LED2, LED3 are changed magneto-electric DC ammeter (microampere meter) A1, A2, A3 for sensitivity, when Weak current passes through this DC ammeter, just have the electric current indication.
Because reometer can not pass through big electric current, so generally series connection one resistance carries out current limliting on reometer;
Judge whether there is short circuit between any measured signal by the swing situation of described DC ammeter,, then do not swung by the DC ammeter of short circuit if there is short circuit.
In sum, short-circuit detecting device of the present invention just can be realized the detection of short circuit under the situation that equipment under test or veneer do not power on, easy to use, and circuit is realized simple, and is with low cost; Again because the electric current of introducing is small, detect even if make equipment under test or veneer exist under the situation of short circuit, also can guarantee the safety of equipment under test or veneer; The testing result indication is obvious, the position that can accurately orient short trouble.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a short-circuit detecting device is characterized in that. comprising: the direct supply that is one another in series, current-limiting resistance and at least one display unit, each display unit is parallel with the short-circuit detecting terminal.
2. short-circuit detecting device according to claim 1 is characterized in that, described display unit is light emitting diode or DC ammeter.
3. short-circuit detecting device according to claim 1 and 2 is characterized in that, also comprises: signal converting unit, the signal converting parts of described signal converting unit for being connected with described every group of short-circuit detecting terminal.
4. short-circuit detecting device according to claim 3 is characterized in that, described signal converting parts are connector.
5. short-circuit detecting device according to claim 3 is characterized in that, described signal converting parts are cable.
6. short-circuit detecting device according to claim 3 is characterized in that, described signal converting parts are a sleeve clamp, and an end of these anchor clamps is convenient to be connected with measured signal, and the other end of these anchor clamps is connected with described short-circuit detecting terminal by cable is convenient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101127423A CN101191813A (en) | 2007-03-09 | 2007-06-14 | Short circuit detection device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710073063 | 2007-03-09 | ||
| CN200710073063.X | 2007-03-09 | ||
| CNA2007101127423A CN101191813A (en) | 2007-03-09 | 2007-06-14 | Short circuit detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101191813A true CN101191813A (en) | 2008-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101127423A Pending CN101191813A (en) | 2007-03-09 | 2007-06-14 | Short circuit detection device |
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| CN (1) | CN101191813A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830323A (en) * | 2012-08-09 | 2012-12-19 | 深圳市华星光电技术有限公司 | Device and method for detecting welding abnormality of electrostatic discharge protection chip |
| CN103941134A (en) * | 2013-01-21 | 2014-07-23 | 神讯电脑(昆山)有限公司 | A wire stock short detection circuit |
| CN106872840A (en) * | 2017-01-09 | 2017-06-20 | 浙江南都电源动力股份有限公司 | Voltage acquisition line short test circuit and equipment |
| CN107861045A (en) * | 2017-10-13 | 2018-03-30 | 天津市英贝特航天科技有限公司 | Short-circuit chip searching device and method based on direct current CT technology |
| CN111835074A (en) * | 2020-01-09 | 2020-10-27 | 广东小天才科技有限公司 | Multi-output charging head |
| CN111948567A (en) * | 2019-04-30 | 2020-11-17 | 烽火通信科技股份有限公司 | Method and system for detecting short circuit before mainboard is powered on |
| CN112684369A (en) * | 2020-11-25 | 2021-04-20 | 华帝股份有限公司 | Wind pressure switch detection system for preventing short circuit between wires of gas appliance |
-
2007
- 2007-06-14 CN CNA2007101127423A patent/CN101191813A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102830323A (en) * | 2012-08-09 | 2012-12-19 | 深圳市华星光电技术有限公司 | Device and method for detecting welding abnormality of electrostatic discharge protection chip |
| WO2014023051A1 (en) * | 2012-08-09 | 2014-02-13 | 深圳市华星光电技术有限公司 | Device and method for detecting welding abnormality of electronic static discharge protection chip |
| CN103941134A (en) * | 2013-01-21 | 2014-07-23 | 神讯电脑(昆山)有限公司 | A wire stock short detection circuit |
| CN106872840A (en) * | 2017-01-09 | 2017-06-20 | 浙江南都电源动力股份有限公司 | Voltage acquisition line short test circuit and equipment |
| CN107861045A (en) * | 2017-10-13 | 2018-03-30 | 天津市英贝特航天科技有限公司 | Short-circuit chip searching device and method based on direct current CT technology |
| CN111948567A (en) * | 2019-04-30 | 2020-11-17 | 烽火通信科技股份有限公司 | Method and system for detecting short circuit before mainboard is powered on |
| CN111948567B (en) * | 2019-04-30 | 2023-04-25 | 烽火通信科技股份有限公司 | Method and system for detecting short circuit before powering on motherboard |
| CN111835074A (en) * | 2020-01-09 | 2020-10-27 | 广东小天才科技有限公司 | Multi-output charging head |
| CN112684369A (en) * | 2020-11-25 | 2021-04-20 | 华帝股份有限公司 | Wind pressure switch detection system for preventing short circuit between wires of gas appliance |
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Open date: 20080604 |