CN205681656U - A kind of LED board constant current detector - Google Patents
A kind of LED board constant current detector Download PDFInfo
- Publication number
- CN205681656U CN205681656U CN201620465656.5U CN201620465656U CN205681656U CN 205681656 U CN205681656 U CN 205681656U CN 201620465656 U CN201620465656 U CN 201620465656U CN 205681656 U CN205681656 U CN 205681656U
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- China
- Prior art keywords
- detection probe
- potentiometer
- connects
- pole detection
- source
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Abstract
A kind of LED board constant current detector, belong to detection technique field, its technical scheme is, composition includes DC source, constant-current source, positive pole detection probe and negative pole detection probe, described constant-current source includes NMOS tube, Zener diode, potentiometer and upper offset resistance, one termination DC power cathode of described potentiometer, the other end connects DC power anode through upper offset resistance, described Zener diode is attempted by potentiometer two ends, the grid of described NMOS tube connects the sliding end of potentiometer, source electrode connects DC power cathode, drain electrode connects negative pole detection probe, described positive pole detection probe connects DC power anode.The electric current that this utility model utilizes detection probe to be exported by constant-current source introduces LED lamp bead, both can detect multiple lamp bead simultaneously, single lamp bead can also be tested, very easy to use, not only substantially increase the detection efficiency of LED board, and maintainer will not contact high voltage, operate fool proof.
Description
Technical field
This utility model relates to a kind of device can being used for quickly detecting the LED lamp bead being connected in series in LED board, belongs to
In detection technique field.
Background technology
At present, increasing Mini Supermarkets and shops are mounted with eye-catching LED board, in order to preferably attract client.
Most of LED boards are to embed the LED lamp bead arranged at equal intervals on the printed words being ready for, then by a certain number of LED
Lamp bead accesses lamp board controller by a cement current-limiting resistance after being connected in series, lamp board controller control the bright of LED lamp bead
Go out and flicker.
Owing to LED lamp bead is connected in series, when indivedual LED lamp bead are damaged, whole string LED lamp bead is all without bright, only
After finding trouble point and the LED lamp bead damaged being changed, this string LED lamp bead just can luminescence.Search the common method of fault lamp bead
Having two kinds, one is to measure one by one with circuit tester (need to be transferred to diode shelves) after deenergization, and the shortcoming of this method is inspection
Survey efficiency is low, generally requires test and just can find fault lamp bead tens times.Another kind of method is use LED in the case of powering on
Lamp string does short circuit and replaces measurement, although the method efficiency is higher, but necessary live line work, owing to lamp board controller is internal generally
Not having reducing transformer, its output voltage (generally 220V) is significantly larger than the safe voltage that human body can bear, careless slightly, will
There is Danger Electric shock risk.Therefore, design that a kind of can quickly to detect LED board trouble point and operate safe detection device be very
Necessary.
Utility model content
The purpose of this utility model is the drawback for prior art, it is provided that a kind of LED board constant current detector, to carry
The detection efficiency of high LED board, it is ensured that the personal safety of maintainer.
Problem described in the utility model realizes with following technical proposals:
A kind of LED board constant current detector, composition includes DC source, constant-current source, positive pole detection probe and negative pole inspection
Probing pin, described constant-current source includes NMOS tube, Zener diode, potentiometer and upper offset resistance, a termination of described potentiometer
DC power cathode, the other end connects DC power anode through upper offset resistance, and described Zener diode is attempted by potentiometer two ends,
The grid of described NMOS tube connects the sliding end of potentiometer, and source electrode connects DC power cathode, and drain electrode connects negative pole detection probe, described just
Pole detection probe connects DC power anode.
Above-mentioned LED board constant current detector, described DC source includes transformator, rectifier bridge and filter capacitor, described change
The primary coil of depressor is connected with alternating current power supply through switch and AC fuse successively, and the exchange that secondary coil connects rectifier bridge is defeated
Entering end, described filter capacitor is attempted by the DC output end of rectifier bridge.
Above-mentioned LED board constant current detector, is also serially connected with direct current between positive pole detection probe and the positive pole of DC source
Side fuse and high voltage protective resistance.
Above-mentioned LED board constant current detector, also includes light emitting diode and current-limiting resistance, after the two is connected in series in composition
It is connected to the outfan of DC source.
The electric current that this utility model utilizes detection probe to be exported by constant-current source introduces LED lamp bead, both can detect many simultaneously
Individual lamp bead, it is also possible to single lamp bead is tested, very easy to use, not only substantially increase the detection efficiency of LED board,
And maintainer will not contact high voltage, operate fool proof.
Accompanying drawing explanation
Fig. 1 is electrical schematic diagram of the present utility model.
Figure is respectively numbered: F1, AC fuse, F2, DC side fuse, S1, switch, T1, transformator, D1, whole
Stream bridge, D2, light emitting diode, D3, Zener diode, C1, filter capacitor, W, potentiometer, Q1, NMOS tube, R1, upper offset electricity
Resistance, R2, high voltage protective resistance, R3, current-limiting resistance.
Detailed description of the invention
The utility model is described in further detail below in conjunction with the accompanying drawings.
This utility model provides a kind of LED board perseverance flow detection device, and this device uses 220V mains-supplied, works as use
When person needs to carry out the LED board broken down trouble point detection, tester can be helped to be quickly found out the LED broken down
Lamp bead, the most at most can detect 35 LED lamp bead, minimum can detect 1 LED lamp bead, convenient to operation and safety is high.
Referring to Fig. 1, this utility model mainly includes AC fuse F1, DC side fuse F2, switch S1, transformator
T1, rectifier bridge D1, light emitting diode D2, Zener diode D3, filter capacitor C1, potentiometer W, NMOS tube Q1, upper offset resistance
(two probes are drawn the most in FIG for R1, high voltage protective resistance R2, current-limiting resistance R3, positive pole detection probe and negative pole detection probe
Go out).
Operation principle of the present utility model is as follows:
AC fuse F1, switch S1, transformator T1, rectifier bridge D1 and filter capacitor C1 form DC source, by height
Pressure alternating current is converted into low-voltage DC；Current-limiting resistance R3 and light emitting diode D2 forms indicator light circuit, shows DC source
Export the most normal；By potentiometer W, NMOS tube Q1, upper offset resistance R1, Zener diode D3, high voltage protective resistance R2 and straight
Stream side fuse F2 composition adjustable constant flow source circuit, wherein, potentiometer W and upper offset resistance R1 composition adjustable voltage division circuit, two
Person forms mu balanced circuit with Zener diode D3, prevents the sampled voltage that potentiometer W exports beyond set point.Regulator potentiometer
The sliding end of W, it is possible to the grid voltage of regulation NMOS tube Q1, thus regulate output electric current, DC side fuse F2 plays protection
Effect, prevents output overcurrent from damaging load, and high voltage protective resistance R2 plays current limliting dividing potential drop effect, and light emitting diode D2 can be prevented at electricity
It is broken down by high-voltage when road is just switched on.
In FIG, out+ and out-on right side is the outfan of constant-current source, respectively with positive pole detection probe and negative pole detection
Probe connect, during detection, positive pole is detected probe and negative pole detection probe respectively with tested LED lamp bead or the two of LED bead string
End in contact, if LED lamp bead or LED bead string normal luminous, illustrates do not have fault, if the most luminous, LED lamp bead or LED is described
Certain lamp bead in lamp bead string is the worst.In order to improve detection efficiency, when starting to detect, detect longer lamp bead string every time, determine event
After the scope of barrier point, then gradually reduce the length of tested lamp bead string, till finding fault lamp bead.
This apparatus structure is simple, easy to use, it is possible to quickly to detect the fault LED lamp bead in LED board, and safety
Can be good.
Claims (2)
1. a LED board constant current detector, is characterized in that: composition include DC source, constant-current source, positive pole detection probe and
Negative pole detection probe, described constant-current source includes NMOS tube (Q1), Zener diode (D3), potentiometer (W) and upper offset resistance
(R1), a termination DC power cathode of described potentiometer (W), the other end connects DC power anode through upper offset resistance (R1),
Described Zener diode (D3) is attempted by potentiometer (W) two ends, and the grid of described NMOS tube (Q1) connects the slip of potentiometer (W)
End, source electrode connects DC power cathode, and drain electrode connects negative pole detection probe, and described positive pole detection probe connects DC power anode；
Described DC source includes transformator (T1), rectifier bridge (D1) and filter capacitor (C1), the former limit of described transformator (T1)
Coil is connected with alternating current power supply through switch (S1) and AC fuse (F1) successively, and secondary coil connects the exchange of rectifier bridge (D1)
Input, described filter capacitor (C1) is attempted by the DC output end of rectifier bridge (D1)；
DC side fuse (F2) and high voltage protective resistance also it is serially connected with between positive pole detection probe and DC power anode
(R2).
A kind of LED board constant current detector the most according to claim 1, is characterized in that, also include light-emitting diodes in composition
Pipe (D2) and current-limiting resistance (R3), the two is connected in series and is followed by the outfan in DC source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620465656.5U CN205681656U (en) | 2016-05-19 | 2016-05-19 | A kind of LED board constant current detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620465656.5U CN205681656U (en) | 2016-05-19 | 2016-05-19 | A kind of LED board constant current detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205681656U true CN205681656U (en) | 2016-11-09 |
Family
ID=57437169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620465656.5U Expired - Fee Related CN205681656U (en) | 2016-05-19 | 2016-05-19 | A kind of LED board constant current detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205681656U (en) |
-
2016
- 2016-05-19 CN CN201620465656.5U patent/CN205681656U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161109 Termination date: 20170519 |