CN202471906U - Rapid tester for performance of light emitting diode - Google Patents

Abstract

The utility model belongs to the technical field of light-emitting diodes, and relates to a fast performance tester for light-emitting diodes. The tester includes a 6V DC power supply, a low-frequency self-excited oscillation circuit, an inverter circuit, a light-emitting diode test terminal, and a DC power supply indicator circuit. The integrated circuit model used by the operational amplifier IC1 is LM324; The two measurement processes are not complicated, but for projects that use a large amount of light-emitting diodes, such as batch testing in the production of LED advertisements or traffic lights, it is very time-consuming. The light-emitting diode performance fast tester described in the utility model is a special test circuit, and the tester can detect without distinguishing the polarity of the light-emitting diode, and quickly judge its performance and luminous brightness. As long as the light-emitting diode is measured once, two test results can be obtained, which has the advantages of simplicity, intuition, time-saving, and high efficiency compared with ordinary multimeters and other testing methods.

Description

Light-emitting diode performance rapid tester

technical field

The utility model belongs to the technical field of light-emitting diode detection, and relates to a light-emitting diode performance fast tester. the

Background technique

There are many methods for testing the performance of light-emitting diodes, but there are no finished products on the market that can detect quickly and have performance comparison. For the production field where a large amount of light-emitting diodes are used, if the light-emitting diodes are not carefully tested and screened, once the light-emitting diodes with performance problems or weak light are soldered to the circuit board, it is very inconvenient to rework and replace them. Damage the pads of the circuit board and greatly affect the production efficiency. The general test device sometimes needs to measure twice. Although the two measurement processes are not complicated, it is very time-consuming for projects that use a large amount of light-emitting diodes, such as batch testing in the production of LED advertisements or traffic lights. The light-emitting diode performance fast tester described in the utility model is a special test circuit, and the tester can detect without distinguishing the polarity of the light-emitting diode, and quickly judge its performance and its luminous brightness. As long as the light-emitting diode is measured once, two test results can be obtained, which has the advantages of simplicity, intuition, time-saving and high efficiency compared with ordinary multimeter and other test methods. the

The relevant technical content involved in the production process of the fast light-emitting diode performance tester described in the present invention will be described in detail below. the

Utility model content

Purpose of the invention and beneficial effects: the general test device sometimes needs to measure twice, although the two measurement processes are not complicated, but for projects with a large amount of light-emitting diodes, such as batch tests such as making LED advertisements or traffic lights, it is very waste time. The light-emitting diode performance fast tester described in the utility model is a special test circuit, and the tester can detect without distinguishing the polarity of the light-emitting diode, and quickly judge its performance and luminous brightness. As long as the light-emitting diode is measured once, two test results can be obtained, which has the advantages of simplicity, intuition, time-saving, and high efficiency compared with ordinary multimeters and other testing methods. the

Technical solution: Light-emitting diode performance quick tester, which includes a 6V DC power supply, a low-frequency self-excited oscillation circuit, an inverter circuit, a light-emitting diode test terminal, and a DC power supply indicating circuit, and is characterized in that:

Low-frequency self-excited oscillation circuit: including operational amplifier IC1, resistor R1, resistor R2, resistor R3 and resistor R4, the type of integrated circuit used in operational amplifier IC1 is LM324, the first pin of operational amplifier IC1 is connected to LED test terminal A and resistor R3 One end of the operational amplifier IC1, the second pin of the operational amplifier IC1 is connected to the other end of the resistor R3 and one end of the resistor R4, the other end of the resistor R4 is connected to the seventh pin of the operational amplifier IC1, the third pin of the operational amplifier IC1 is connected to one end of the resistor R1 and the resistor One end of R2, the 4th pin of the operational amplifier IC1 and the other end of the resistor R1 are connected to the positive pole VCC of the 6V DC power supply, the 11th pin of the operational amplifier IC1 and the other end of the resistor R2 are connected to the circuit ground GND;

Inverter circuit: composed of operational amplifier IC1, resistor R6, resistor R7, resistor R8, resistor R9 and electrolytic capacitor C1, the 6th pin of operational amplifier IC1 is connected to one end of resistor R8, one end of resistor R9, and the first terminal of operational amplifier IC1 Pin 7 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to the LED test terminal B, the other end of the resistor R8 is connected to the positive pole VCC of the 6V DC power supply, the other end of the resistor R9 is connected to the circuit ground GND, and the fifth pin of the operational amplifier IC1 is connected to The positive pole of the electrolytic capacitor C1 is connected to one end of the resistor R7, the seventh pin of the operational amplifier IC1 is connected to the other end of the resistor R7, and the negative pole of the electrolytic capacitor C1 is connected to the circuit ground GND. the

DC power supply indicating circuit: One end of the resistor R5 is connected to the positive pole of the 6V DC power supply VCC, the other end of the resistor R5 is connected to the positive pole of the light-emitting diode LED, and the negative pole of the light-emitting diode LED is connected to the circuit ground GND. the

The working principle of the circuit: one operational amplifier is connected as a low-frequency self-excited oscillator, and the output terminal intermittently outputs high or low levels; the other operational amplifier is connected as an inverter. When the oscillator circuit outputs a high level, the inverter outputs a low level; when the low-frequency self-excited oscillator circuit outputs a low level, the inverter outputs a high level. If one light-emitting diode is connected to the two output terminals of A and B, no matter how the polarity of the connected light-emitting diode is, the light-emitting diode always follows the oscillation frequency of the oscillator circuit, so that the light-emitting diode is intermittently turned on and emits light. The light-emitting diode LED in the DC power supply circuit is an indication of the state of the DC power supply, and can be used as a comparison of the light-emitting brightness of the detected light-emitting diode. The type of operational amplifier IC1 is LM324 or LM358. the

Description of drawings

Accompanying drawing 1 is the working principle diagram of the circuit of the embodiment of a light-emitting diode performance quick tester provided by the utility model. the

Detailed ways

The utility model can be realized by implementing the circuit working principle diagram and the description of the accompanying drawings and the technical requirements of components described below according to the light-emitting diode performance quick tester shown in accompanying drawing 1. the

Selection of components and their technical parameters

IC1 is an operational amplifier. The recommended integrated circuit model is LM324 or LM358. It is a circuit composed of four sets of independent operational amplifiers. It can work in a wide range of single power supply voltage or under dual power supply conditions. Work, power supply voltage working range: single power supply 3V ~ 30V, dual power supply ± 1.5V ~ ± 15V; this embodiment only uses two IC1-A and IC1-D in four groups of operational amplifiers LM324;

The package of LM324 integrated circuit is dual-in-line, and its 14 pins and functions are:

1 pin OUTPUT1, 2 pins INPUT1-, 3 pins INPUT1+; 4 pins connected to the positive VCC of the power supply; 5 pins INPUT 2+, 6 pins INPUT 2-, 7 pins OUTPUT 2; 8 pins OUTPUT 3, 9 pins INPUT 3-, 10 Pin INPUT3+; pin 11 is connected to the circuit ground GND, namely: the negative pole of the DC power supply; pin 12 INPUT4+, pin 13 INPUT4-, pin 14 OUTPUT4;

OUTPUT is the output terminal of the operational amplifier; INPUT+ is the positive input terminal of the operational amplifier; INPUT- is the negative input terminal of the operational amplifier;

All circuits use 1/8 metal film resistors, and the resistance values of resistor R1, resistor R2, resistor R3, resistor R8 and resistor R9 are all 50k Ω;

The resistance value of resistor R4 is 10k Ω; the resistance value of resistor R5 is 1k Ω; the resistance value of resistor R6 is 910Ω; the resistance value of resistor R7 is 100k Ω;

C1 is an electrolytic capacitor with a capacity of 1μF and 16V;

AN is a normally open key switch;

6V DC power supply, you can use four 5# alkaline batteries. the

Main points of circuit making, circuit debugging and use

As long as the circuit of the light-emitting diode performance quick tester uses electronic components with good performance, solder them according to the connection relationship of the components shown in Figure 1, and carefully check the physical wiring and check that they are correct, the circuit does not need any debugging. normal work;

The electrolytic capacitor C1 is used to adjust the flickering frequency of the light-emitting diode under test. The larger the capacity of the electrolytic capacitor C1, the lower the flickering frequency of the light-emitting diode under test. The recommended value of the capacity of the electrolytic capacitor C1 is 1 μF;

The brightness of the light-emitting diode under test can be adjusted by adjusting the resistance value of the resistor R6. If the brightness of the light-emitting diode under test is not enough, the resistance value of the resistor R6 can be appropriately reduced;

The test terminal A and test terminal B of the light-emitting diode performance quick tester are the connection terminals of the light-emitting diode under test, and the light-emitting diode under test can be used without distinguishing the positive and negative poles. the

Claims (2)

1. A light-emitting diode performance quick tester, which comprises a 6V DC power supply, a low-frequency self-excited oscillation circuit, an inverter circuit, a light-emitting diode test terminal, and a direct-current power supply indicating circuit, is characterized in that: The low-frequency self-excited oscillation circuit includes operational amplifier IC1, resistor R1, resistor R2, resistor R3 and resistor R4. The type of integrated circuit used in operational amplifier IC1 is LM324. The first pin of operational amplifier IC1 is connected to LED test terminal A and resistor R3. At one end, the second pin of the operational amplifier IC1 is connected to the other end of the resistor R3 and one end of the resistor R4, the other end of the resistor R4 is connected to the seventh pin of the operational amplifier IC1, and the third pin of the operational amplifier IC1 is connected to one end of the resistor R1 and the resistor R2 One end, the 4th pin of the operational amplifier IC1 and the other end of the resistor R1 are connected to the positive pole VCC of the 6V DC power supply, the 11th pin of the operational amplifier IC1 and the other end of the resistor R2 are connected to the circuit ground GND; The inverter circuit is composed of operational amplifier IC1, resistor R6, resistor R7, resistor R8, resistor R9 and electrolytic capacitor C1. The sixth pin of operational amplifier IC1 is connected to one end of resistor R8 and one end of resistor R9, and the seventh pin of operational amplifier IC1 One end of the resistor R6 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to the LED test terminal B, the other end of the resistor R8 is connected to the positive pole VCC of the 6V DC power supply, the other end of the resistor R9 is connected to the circuit ground GND, and the fifth pin of the operational amplifier IC1 is connected to the electrolytic The positive pole of the capacitor C1 and one end of the resistor R7, the seventh pin of the operational amplifier IC1 is connected to the other end of the resistor R7, and the negative pole of the electrolytic capacitor C1 is connected to the circuit ground GND. 2. The light-emitting diode performance quick tester according to claim 1, characterized in that: one end of the resistor R5 in the DC power supply indicating circuit is connected to the positive pole VCC of the 6V DC power supply, the other end of the resistor R5 is connected to the positive pole of the light-emitting diode LED, and the light-emitting diode The negative pole of the LED is connected to the circuit ground GND.

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