CN101109783A - Electrical parameter testing circuit for light emitting diode - Google Patents
Electrical parameter testing circuit for light emitting diode Download PDFInfo
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- CN101109783A CN101109783A CN 200610147111 CN200610147111A CN101109783A CN 101109783 A CN101109783 A CN 101109783A CN 200610147111 CN200610147111 CN 200610147111 CN 200610147111 A CN200610147111 A CN 200610147111A CN 101109783 A CN101109783 A CN 101109783A
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Abstract
The invention discloses a circuit for testing the electric parameters of a LED. Wherein, the circuit comprises a calibrating circuit, a constant-voltage controlling circuit and a constant-current controlling circuit. In the calibrating circuit, a standard power supply is provided for providing the standard power supply for the self checking of the whole circuit; the constant-voltage controlling circuit provides a high-precision reference voltage for a constant-voltage supply through a D/A constant-voltage supply reference; the constant-current controlling circuit provides a high-precision reference voltage for a constant-current supply through a D/A constant-voltage supply reference; the constant-voltage controlling circuit and the constant-current controlling circuit are provided with a feedback circuit respectively, which increases the output accuracy of the power supply.
Description
Technical field
The present invention relates to the electronic circuit test field, specially refer to a kind of electric parameter detecting circuit of light emitting diode.
Background technology
Usually light emitting diode need be tested its electrical parameter or optical parametric, to guarantee its correlated performance index and usability after encapsulation is finished.Method of testing in the past mainly is to utilize special-purpose light emitting diode instrument to finish, and ubiquity efficient is low, the shortcoming that precision is low; What generally use at present is that the circuit that automaticity is higher and precision is higher is finished test, this method of testing was compared than former artificial beam split, there is very big progress, but still there are some defectives in itself, such as when testing the light emitting diode forward voltage, after light emitting diode and the conducting of forward constant current source, discovery decreases by the forward current prolongation in time of light emitting diode, and just can stablize after dropping to a top degree, therefore, directly caused the light emitting diode forward voltage values of surveying higher; And under different voltage environment, every electrical parameter of test light emitting diode all can have than mistake; The precision of selected electronic devices and components in test circuit, the sensitivity difference often also can cause test result to have error, and the setting range of current source or voltage source is less, has equally also influenced the scope that can test the light emitting diode object.
Summary of the invention
The invention provides a kind of electric parameter detecting circuit of light emitting diode, wherein, resistance R 1, R2 connect with R3, be connected between ground wire and the constant pressure source/constant current source, by the output of computing machine upper strata Control Software control constant pressure source/constant current source, the sampling voltage at resistance R 2 two ends and the standard voltage source of appointment all input to computing machine upper strata Control Software by commutation circuit; The standard voltage source place in circuit constitutes the calibration loop of this circuit; Computing machine upper strata Control Software is joined with D/A constant pressure source benchmark and D/A constant current source benchmark respectively, described D/A constant pressure source benchmark and D/A constant current source benchmark provide reference voltage separately respectively, described D/A constant pressure source benchmark links to each other with constant pressure source by an input end of the comparer corresponding with it, node potential between resistance R 2 and the R3 links to each other with another input end of comparer, form the feedback circuit relevant with constant pressure source, the output terminal of this comparer is connected with constant pressure source, and constant pressure source and its feedback circuit road constitute the constant voltage control loop of this circuit; In described second loop, comparer compares judgement with the input voltage of node potential between resistance R 2 and the R3 and D/A constant pressure source benchmark, guarantees that FH point current potential is within the potential range of being controlled; Described D/A constant current source benchmark links to each other with constant current source by an input end of the comparer corresponding with it, the sampling voltage at resistance R 1 two ends links to each other with another input end of comparer, form the feedback circuit relevant with constant current source, the output terminal of this comparer is connected with constant current source, and constant current source and its feedback circuit road constitute the constant current control loop of this circuit; With the corresponding comparer of D/A constant current source benchmark the input voltage that the sampling voltage and the D/A constant current source benchmark at resistance R 1 two ends provides is compared judgement in the described tertiary circuit, guarantee that electric current by R1 is within the effective range of control; When testing light emitting diode to be measured, resistance R 3 disconnects with resistance R 1, R2, and light emitting diode to be measured is connected with resistance R 1, R2.
By above technical scheme as can be seen, the present invention has following advantage:
At first, be provided with reference power supply in the circuit, entire circuit self check reference power supply is provided, prevent that test from producing error;
Secondly, D/A constant current source benchmark and D/A constant pressure source benchmark provide the reference voltage of high-precision constant current source and constant pressure source respectively;
Once more, integrated operational amplifier and single tube amplify array mode provides power supply, improves output power of power supply;
At last, comprise feedback circuit in the circuit, improved the output accuracy of power supply.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Fig. 1 is the circuit diagram that the invention provides the electric parameter detecting circuit of light emitting diode;
Fig. 2 is the principle flow chart of circuit shown in Figure 1;
Fig. 3 is the first embodiment of the invention process flow diagram;
Fig. 4 is the second embodiment of the invention process flow diagram.
Embodiment
What Fig. 1 described is the circuit diagram of the electric parameter detecting circuit of light emitting diode provided by the present invention, wherein, resistance R 1, R2 connect with R3, be connected between power supply and ground wire and the constant pressure source/constant current source, by the output of computing machine upper strata Control Software control constant pressure source/constant current source, the sampling voltage at resistance R 2 two ends and the standard voltage source of appointment all input to computing machine upper strata Control Software by commutation circuit; The standard voltage source place in circuit can be finished entire circuit is carried out verification; Computing machine upper strata Control Software is joined with D/A constant pressure source benchmark and D/A constant current source benchmark respectively, described D/A constant pressure source benchmark links to each other with constant pressure source by an input end of the comparer corresponding with it, node potential between resistance R 2 and the R3 links to each other with another input end of comparer, form the feedback circuit relevant with constant pressure source, the output terminal of this comparer is connected with constant pressure source, and constant pressure source and its feedback circuit road constitute second loop of this circuit; Described D/A constant current source benchmark links to each other with constant current source by an input end of the comparer corresponding with it, the sampling voltage at resistance R 1 two ends links to each other with another input end of comparer, form the feedback circuit relevant with constant current source, the output terminal of this comparer is connected with constant current source respectively, and constant current source and its feedback circuit road constitute the tertiary circuit of this circuit; But light emitting diode and resistance R 3 switch in parallel, and report both end voltage to the computing machine upper layer software (applications) of light emitting diode to show.
Fig. 2 describes is the principle flow chart of circuit diagram of the electric parameter detecting circuit of light emitting diode.Comprise step:
D1) circuit is calibrated, comprised gain and the verification of A/D path, the circuit checks under the constant current source mode, the circuit checks under the constant pressure source mode;
D2) user proposes test request as required, and the included information of request message is sent in the electric parameter detecting circuit of described light emitting diode by upper layer software (applications) and ISA slot;
D3) electric parameter detecting circuit of described light emitting diode basis address and data wherein, the electric parameter detecting circuit of control light emitting diode is operated in constant current source mode or constant pressure source mode;
D4) electric parameter detecting circuit of described light emitting diode is operated in constant current source mode or constant pressure source mode, and finishes the test to the light emitting diode electrical parameter, and electrical parameter is reported to upper layer software (applications).
See also Fig. 3, be the second embodiment of the invention process flow diagram, this embodiment has mainly reflected when the electric parameter detecting circuit of described light emitting diode works in the constant current source mode, the implementation process that the present invention is complete.
S1) standard voltage source place in circuit is finished entire circuit is carried out verification, and the automatic correction compensation value;
S2) upper layer software (applications) carries out data-switching according to automatic calculating of user profile and output data to D/A constant current source benchmark;
S3) electric parameter detecting circuit that described light emitting diode is set works in forward constant current source mode;
S4) result after will changing and the sampling voltage at resistance R 1 two ends compare, and control described forward constant current source output forward steady current according to comparative result;
S5) according to simple algorithm test positive voltage of light emitting diode and reverse voltage; Concrete grammar shows as: the forward current and the inverse current that pass through R1 in the constant circuit, test out the difference voltage between FH and the FL, the numerical value of described difference voltage is returned computing machine, thereby finished test positive voltage of light emitting diode and reverse voltage.
See also Fig. 4, be the third embodiment of the invention process flow diagram, this embodiment has mainly reflected when the electric parameter detecting circuit of described light emitting diode works in the constant pressure source mode, the implementation process that the present invention is complete.
J1) standard voltage source place in circuit is finished entire circuit is carried out verification, and the automatic correction compensation value;
J2) upper layer software (applications) carries out data-switching to D/A constant pressure source benchmark, the point voltage that constant FH is ordered according to automatic calculating of user profile and output data;
J3) electric parameter detecting circuit that described light emitting diode is set works in the constant pressure source mode;
J4) will compare through the point voltage that result after the D/A constant pressure source benchmark conversion and FH are ordered, and control the point voltage that FH orders according to comparative result and be operated under the given voltage;
J5) and forward current and two parameters of inverse current of testing light emitting diode, concrete grammar shows as: the difference voltage in the constant circuit between FH and the FL, and test is by the electric current I of R2, because resistance R 2 is connected in the circuit with light emitting diode, so electric current I is the current value of light emitting diode, current value is returned computing machine, thereby finished test the forward current and the inverse current of light emitting diode.
In sum, before described light emitting diode is tested, at first, both provided entire circuit self check reference power supply, the related defects of avoiding circuit to exist by reference power supply provided by the present invention; The reference voltage of high-precision constant current source and constant pressure source further is provided respectively by D/A constant current source benchmark and D/A constant pressure source benchmark; And in circuit, comprise feedback circuit, guarantee the output accuracy of power supply.At last, the user can accurately measure forward current, inverse current or forward voltage, the reverse voltage of described light emitting diode by the operation interface of upper layer software (applications) selectively according to the actual needs of oneself.
More than the electric parameter detecting circuit of a kind of light emitting diode provided by the present invention is described in detail, used specific example herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for the general technology foundation thought of the present invention of this area, the part that on specific implementations and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (1)
1. the electric parameter detecting circuit of a light emitting diode, it is characterized in that, resistance R 1, R2 connect with R3, be connected between ground wire and the constant pressure source/constant current source, output by computing machine upper strata Control Software control constant pressure source/constant current source, the standard voltage source place in circuit, constitute the calibration loop of this circuit, sample circuit by resistance R 2 two ends obtains this current in loop size, and the current value that obtains and the standard voltage source of appointment are all inputed to computing machine upper strata Control Software by commutation circuit; Computing machine upper strata Control Software is joined with D/A constant pressure source benchmark and D/A constant current source benchmark respectively, described D/A constant pressure source benchmark links to each other with constant pressure source by an input end of the comparer corresponding with it, node potential between resistance R 2 and the R3 links to each other with another input end of comparer, form the feedback circuit relevant with constant pressure source, the output terminal of this comparer is connected with constant pressure source, and constant pressure source and its feedback circuit constitute the constant voltage control loop of this circuit; Described D/A constant current source benchmark links to each other with constant current source by an input end of the comparer corresponding with it, the sampling voltage at resistance R 1 two ends links to each other with another input end of comparer, form the feedback circuit relevant with constant current source, the output terminal of this comparer is connected with constant current source respectively, and constant current source and its feedback circuit road constitute the constant current control loop of this circuit; During the test light emitting diode, resistance R 3 disconnects with resistance R 1, R2, and light emitting diode to be measured is connected with resistance R 1, R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610147111 CN101109783A (en) | 2006-07-18 | 2006-11-08 | Electrical parameter testing circuit for light emitting diode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610061729 CN1900729A (en) | 2006-07-18 | 2006-07-18 | Electric parameter detecting circuit for light emitting diode |
| CN200610061729.5 | 2006-07-18 | ||
| CN 200610147111 CN101109783A (en) | 2006-07-18 | 2006-11-08 | Electrical parameter testing circuit for light emitting diode |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881808A (en) * | 2010-06-28 | 2010-11-10 | 陕西科技大学 | An organic light-emitting diode life detector |
| CN102565661A (en) * | 2012-03-13 | 2012-07-11 | 刘喆 | All-purpose detector for performance of light-emitting diode (LED) |
| CN102621467A (en) * | 2012-03-26 | 2012-08-01 | 朱虹 | Quick tester of LED performance |
| CN101957406B (en) * | 2009-07-14 | 2012-08-22 | 致茂电子(苏州)有限公司 | Method for detecting light bar and detection machine board |
| CN104181450A (en) * | 2014-09-02 | 2014-12-03 | 中国科学院半导体研究所 | System and method for testing light-emitting diode response characteristics |
| CN105954662A (en) * | 2016-06-18 | 2016-09-21 | 温州大学 | Power diode reverse breakdown voltage grading test apparatus |
| CN109212307A (en) * | 2017-06-30 | 2019-01-15 | 致茂电子(苏州)有限公司 | Measuring signal device and measuring signal method |
| WO2020014919A1 (en) * | 2018-07-19 | 2020-01-23 | Tridonic Gmbh & Co Kg | Power supply circuit, controlling method and lighting device driver |
| CN113075525A (en) * | 2021-04-14 | 2021-07-06 | 东莞市谷麦光学科技有限公司 | Voltage correction method for LED light splitting station |
-
2006
- 2006-11-08 CN CN 200610147111 patent/CN101109783A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957406B (en) * | 2009-07-14 | 2012-08-22 | 致茂电子(苏州)有限公司 | Method for detecting light bar and detection machine board |
| CN101881808A (en) * | 2010-06-28 | 2010-11-10 | 陕西科技大学 | An organic light-emitting diode life detector |
| CN102565661A (en) * | 2012-03-13 | 2012-07-11 | 刘喆 | All-purpose detector for performance of light-emitting diode (LED) |
| CN102621467A (en) * | 2012-03-26 | 2012-08-01 | 朱虹 | Quick tester of LED performance |
| CN104181450A (en) * | 2014-09-02 | 2014-12-03 | 中国科学院半导体研究所 | System and method for testing light-emitting diode response characteristics |
| CN105954662A (en) * | 2016-06-18 | 2016-09-21 | 温州大学 | Power diode reverse breakdown voltage grading test apparatus |
| CN109212307A (en) * | 2017-06-30 | 2019-01-15 | 致茂电子(苏州)有限公司 | Measuring signal device and measuring signal method |
| CN109212307B (en) * | 2017-06-30 | 2020-12-18 | 致茂电子(苏州)有限公司 | Signal measurement device and signal measurement method |
| WO2020014919A1 (en) * | 2018-07-19 | 2020-01-23 | Tridonic Gmbh & Co Kg | Power supply circuit, controlling method and lighting device driver |
| GB2587286A (en) * | 2018-07-19 | 2021-03-24 | Tridonic Gmbh & Co Kg | Power supply circuit, controlling method and lighting device driver |
| GB2587286B (en) * | 2018-07-19 | 2022-08-17 | Tridonic Gmbh & Co Kg | Power supply circuit, controlling method and lighting device driver |
| CN113075525A (en) * | 2021-04-14 | 2021-07-06 | 东莞市谷麦光学科技有限公司 | Voltage correction method for LED light splitting station |
| CN113075525B (en) * | 2021-04-14 | 2022-03-22 | 东莞市谷麦光学科技有限公司 | Voltage correction method for LED light splitting station |
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