CN104049192B - A kind of low-power LED test device and multiple constant current output circuit thereof - Google Patents
A kind of low-power LED test device and multiple constant current output circuit thereof Download PDFInfo
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- CN104049192B CN104049192B CN201310084672.0A CN201310084672A CN104049192B CN 104049192 B CN104049192 B CN 104049192B CN 201310084672 A CN201310084672 A CN 201310084672A CN 104049192 B CN104049192 B CN 104049192B
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Abstract
The invention belongs to test circuit field, particularly relate to a kind of low-power LED test device and multiple constant current output circuit thereof.The multiple constant current output circuit of the low-power LED test that the present invention provides includes: the power circuit unit connected with external direct current power supply plug；Switch on power as required and switch the function switch of electric current gear；And output constant current electric current is to the constant current chip of multiple accessory power outlets.Its circuit structure is simple, is applicable to conventional common LED and the test of Piranha LED；And by the selection of different constant current chips, can realize multichannel electric current constant current value optional, performance safety is reliable, low price.
Description
Technical field
The invention belongs to test circuit field, particularly relate to a kind of low-power LED test device and multichannel thereof
Constant current output circuit.
Background technology
Along with the development of illuminating industry, LED has become basically universal in the application of every field.For light fixture system
For making enterprise, LED self photoelectric parameter of LED supplied materials and performance are carried out detection is requisite
Link.But during LED self photoelectric parameter and performance are tested, the problem master existed
Have: the milliampere gear of conventional regulated power supply is accurate not, and the current wave of the small area analysis gear of such power supply
Dynamic scope is big, can affect the accuracy of testing photoelectronic parameter；If purchasing the power supply with precision current gear,
Then the price of this test power supply itself is the most much more expensive.A kind of easy high-accuracy small-power it is accomplished by market
The multiple constant current output circuit of LED test solves this problem.
Summary of the invention
The purpose of the present invention first consists in the multiple constant current output circuit providing the test of a kind of low-power LED,
Aim to solve the problem that in the test of current low-power LED, electric current precision is on the low side, and test apparatus expensive, cost
Too high technical problem.
To achieve these goals, the technical solution adopted in the present invention is:
A kind of multiple constant current output circuit of low-power LED test, including:
The power circuit unit connected with external direct current power supply plug；
Connect with described power circuit unit, for switching on power as required and switching the merit of electric current gear
Can permutator；And
It is connected to described function switch and for fixing multiple outputs of low-power LED pin to be tested
Constant current chip between socket, for output constant current electric current.
Further, described circuit also includes: be connected between described constant current chip and ground, to output electric current
The filter unit being filtered.
The present invention also aims to provide a kind of low-power LED test device, described device just includes
Above-mentioned multiple constant current output circuit.
The low-power LED that the present invention provides tests device and multiple constant current output circuit thereof, is often applicable to
Rule common LED and the test of Piranha LED；And have simple in construction, multichannel electric current constant current value optional,
The advantages such as safe and reliable, low price.
Accompanying drawing explanation
Fig. 1 is the structure of the multiple constant current output circuit of the low-power LED test that the embodiment of the present invention provides
Block diagram；
Fig. 2 is first device of the multiple constant current output circuit of the low-power LED test that the embodiment of the present invention provides
Part schematic diagram.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and reality
Execute example, the present invention is further elaborated.Only should be appreciated that specific embodiment described herein
Only in order to explain the present invention, it is not intended to limit the present invention.
The multiple constant current output circuit of the low-power LED test that the present invention provides, is applicable to conventional common
LED and the test of Piranha LED, simple in construction, and multichannel electric current constant current value be optional, safe and reliable,
Low price.
Fig. 1 is the structure of the multiple constant current output circuit of the low-power LED test that the embodiment of the present invention provides
Block diagram；For convenience of description, illustrate only part related to the present embodiment, as shown in the figure:
A kind of multiple constant current output circuit of low-power LED test, including: power circuit unit 10, merit
Energy permutator 20, constant current chip 30 and multiple accessory power outlet 50；
Wherein, power circuit unit 10 is for connecting with external DC power plug；Multiple accessory power outlets
50 pins being respectively used to fixing low-power LED to be tested, the concrete number of accessory power outlet and constant current chip
The outfan one_to_one corresponding of 30；Function switch 20 is inserted with power circuit unit 10 and multiple output respectively
Seat 50 connects, may be used for the needs according to user switches on power and switches electric current gear；Constant current chip
30 are connected with multiple accessory power outlets 50, give low-power LED to be tested for output constant current electric current.
Further, as a preferred embodiment, the multichannel of the low-power LED test that the present embodiment provides
Constant current output circuit also includes a filter unit being connected between constant current chip 30 and ground 40, this filtering
Unit 40 is mainly used in output electric current is filtered rectification.
Fig. 2 is first device of the multiple constant current output circuit of the low-power LED test that the embodiment of the present invention provides
Part schematic diagram；Same, for convenience of description, again illustrate only part related to the present embodiment, such as figure
Shown in:
Power circuit unit 10 includes: input charge port J1, lithium battery BT and Schottky diode D1；
Function switch 20 is the double-point double-throw switch SW1 with 6 wiring pins.The model of constant current chip 30
Can be AMC7110, AMC7111, AMC7113 or AMC7114 etc., need special instruction
It is that the model of a few class constant current chips listed herein only enumerates, is not used in the class limiting constant current chip 30
Type.In the present embodiment, illustrate with AMC7110 for preferred embodiment；Defeated with AMC7110
Going out to hold corresponding, the concrete number of multiple accessory power outlets 50 is then 3, in this figure respectively with socket J2,
Socket J3 and socket J4 represents.
Specifically, external direct current power supply accesses described input charge port J1, and the positive pole of external direct current power supply connects
The anode of Schottky diode D1, the negative pole of external direct current power supply connects the negative pole of lithium battery BT, Schottky
The negative electrode of diode D1 and the positive pole of the lithium battery BT connection function i.e. DPDT of permutator 20(simultaneously is opened
Close SW1) the 2nd wiring pin.This power circuit unit 10 uses external direct current power supply and internal lithium battery
Both of which is powered, it is possible to preferably meet the demand of user.Schottky diode D1 connects in this
Main purpose is to play the protective effect of circuit reversal connection.
As it has been described above, the 2nd wiring pin of double-point double-throw switch SW1 is simultaneously connected with Schottky diode D1
Negative electrode and the positive pole of lithium battery BT, the 3rd of double-point double-throw switch SW1 the, 4 wiring pins connect constant current simultaneously
5th wiring pin of the power end VDD of chip 30, double-point double-throw switch SW1 connects making of constant current chip 30
Energy end EN, the 6th wiring pin of double-point double-throw switch SW1 also meets the power end VDD of constant current chip 30,
1st wiring pin of double-point double-throw switch SW1 combination hub J2, socket J3 and 1 foot of socket J4 simultaneously.
Outfan LED1, LED2 and LED3 of constant current chip 30 combination hub J2, socket J3 and socket respectively
2 feet of J4.
Additionally, the multiple constant current output circuit that the low-power LED that the present embodiment provides is tested also includes connecting
The filter unit 40 being filtered between constant current chip 30 and ground, to output electric current.With reference to Fig. 2, this
The filter unit 30 that embodiment provides includes electric capacity C1；Electric capacity C1 is connected to the power end of constant current chip 30
Between VDD and ground.
The operation principle of the multiple constant current output circuit of the low-power LED test below the present embodiment provided
It is briefly described.
When double-point double-throw switch SW1 Guan Bi the 2nd, 4 wiring pin, the positive pole of power circuit unit 10 connects
Entering the power end VDD of constant current chip 30, the 1st of double-point double-throw switch SW1 the, 6 wiring pins are connected simultaneously,
1 foot of socket J2, socket J3 and socket J4 the most all receives the power end VDD of constant current chip 30, socket
2 feet of J2, socket J3 and socket J4 all export the electric current of 20mA；May be used for conventional common LED and
The test of Piranha LED.
When double-point double-throw switch SW1 Guan Bi the 2nd, 3 wiring pin, the positive pole of power circuit unit 10 is same
Sample accesses the power end VDD of constant current chip 30, simultaneously the 1st of double-point double-throw switch SW1 the, 5 wiring pins
Connecting, 1 foot of socket J2, socket J3 and socket J4 all receives Enable Pin EN of constant current chip 30, inserts
2 feet of seat J2, socket J3 and socket J4 the most all export the electric current of 10mA；It is equally applicable to conventional common
LED and the test of Piranha LED；
When double-point double-throw switch SW1 pushes centre position, power circuit disconnects, and this low-power LED is surveyed
The multiple constant current output circuit of examination is not operated.
The embodiment of the present invention also provides for the test device of a kind of low-power LED, and this device just includes above-mentioned
Multiple constant current output circuit under any form.
In sum, the low-power LED that more embodiment of the present invention provides tests device and multiple constant current thereof
Output circuit, simple in construction, it is applicable to conventional common LED and the test of Piranha LED；And lead to
Cross the selection of different constant current chip, multichannel electric current constant current value can be realized optional, performance safety is reliable, price just
Preferably.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, although reference
Previous embodiment has carried out explanation in greater detail to the present invention, and for a person skilled in the art, it depends on
So the technical scheme described in foregoing embodiments can be modified or to wherein portion of techniques feature
Carry out equivalent.All any amendment, equivalents made within the spirit and principles in the present invention and changing
Enter, should be included within the scope of the present invention.
Claims (7)
1. the multiple constant current output circuit for low-power LED test, it is characterised in that described electricity
Road includes:
The power circuit unit connected with external direct current power supply plug；
Connect with described power circuit unit and for switching on power as required and switching electric current gear
Function switch；And
It is connected to described function switch and for fixing multiple outputs of low-power LED pin to be tested
Between socket and for output constant current electric current constant current chip；
Described power circuit unit includes: input charge port J1, lithium battery BT and Schottky diode D1；
External direct current power supply accesses described input charge port J1, and the positive pole of external direct current power supply connects described Schottky two pole
The anode of pipe D1, the negative pole of external direct current power supply connects the negative pole of described lithium battery BT, described Schottky two
The negative electrode of pole pipe D1 and the positive pole of described lithium battery BT connect described function switch simultaneously.
2. the multiple constant current output circuit for low-power LED test as claimed in claim 1, it is special
Levying and be, described circuit also includes:
The filter unit being connected between described constant current chip and ground and output electric current is filtered.
3. the multiple constant current output circuit for low-power LED test as claimed in claim 1, it is special
Levying and be, described function switch is double-point double-throw switch SW1；
2nd wiring pin of described double-point double-throw switch SW1 connects the moon of described Schottky diode D1 simultaneously
Pole and the positive pole of described lithium battery BT, the 3rd wiring pin and the 4th of described double-point double-throw switch SW1 connects
Stitch connects the power end of described constant current chip simultaneously, and the 5th wiring pin of described double-point double-throw switch SW1 connects
The Enable Pin of described constant current chip, the 6th wiring pin of described double-point double-throw switch SW1 also connects described constant current
The power end of chip, the 1st wiring pin of described double-point double-throw switch SW1 connects the plurality of output simultaneously and inserts
1 foot of seat.
4. the multiple constant current output circuit for low-power LED test as claimed in claim 3, it is special
Levy and be, the model of described constant current chip be AMC7110, AMC7111, AMC7113 or
AMC7114；The outfan of described constant current chip connects 2 feet of each accessory power outlet respectively.
5. the multiple constant current output circuit for low-power LED test as claimed in claim 2, it is special
Levying and be, described filter unit includes electric capacity C1；Described electric capacity C1 is connected to the power supply of described constant current chip
Between end and ground.
6. the multiple constant current output electricity for low-power LED test as described in any one of claim 1-5
Road, it is characterised in that described low-power LED to be tested includes conventional common LED and Piranha LED.
7. a low-power LED test device, it is characterised in that described low-power LED test device
Including the multiple constant current output circuit as described in any one of claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310084672.0A CN104049192B (en) | 2013-03-15 | 2013-03-15 | A kind of low-power LED test device and multiple constant current output circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310084672.0A CN104049192B (en) | 2013-03-15 | 2013-03-15 | A kind of low-power LED test device and multiple constant current output circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104049192A CN104049192A (en) | 2014-09-17 |
| CN104049192B true CN104049192B (en) | 2016-12-28 |
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| CN201310084672.0A Expired - Fee Related CN104049192B (en) | 2013-03-15 | 2013-03-15 | A kind of low-power LED test device and multiple constant current output circuit thereof |
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| CN202634851U (en) * | 2012-07-03 | 2012-12-26 | 成都市宏山科技有限公司 | Constant-current driving circuit for LEDs in system test |
| CN102928760A (en) * | 2012-10-31 | 2013-02-13 | 许伟清 | Light-emitting diode (LED) ageing test system and method |
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2013
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Patent Citations (9)
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| CN101925214A (en) * | 2009-06-17 | 2010-12-22 | 海洋王照明科技股份有限公司 | LED constant current circuit and method |
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| CN201860479U (en) * | 2010-06-10 | 2011-06-08 | 甘国锐 | LED constant-current supply with high efficiency and high precision |
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| CN102548145A (en) * | 2011-12-31 | 2012-07-04 | 江苏三显照明科技有限公司 | Constant-current power supply with adjustable gears |
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| Publication number | Publication date |
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| CN104049192A (en) | 2014-09-17 |
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Granted publication date: 20161228 Termination date: 20190315 |