Light-emitting diode manufacturers to tell you the reasons for dead lights in the welding of lamp beads!

Following the widespread use of led lighting fixtures, led SMD has become one of the sought-after original materials, it is a small power SMD lamp beads belonging to the SMD light-emitting diode series. However, in the process of production, will inevitably present some problems, the following to discuss the problems presented in the welding of light beads!

1. Welding process dead light:

Common welding methods can be divided into soldering iron welding, heating channel welding and reflow soldering and so on.

A, soldering iron soldering is the most common, such as making samples, maintenance, because most existing manufacturers in order to save money, the purchase of the soldering iron is mostly unqualified

Qualified slightly quality products, most of the poor grounding, there is leakage, the welding process, which is equivalent to the tip of the iron in the leakage - LED - human body

The earth constitutes a circuit, which is equal to tens of times - hundreds of times the voltage received by the lamp beads added to the LED beads above, instantly burn it.

Note: The situation will be more serious when connected to the electrostatic band, because when the human body is connected to the electrostatic band to the ground to form a circuit of resistance is smaller, after the human body to the lamp beads

The current will be greater, which is also a lot of people say that there is clearly with static electricity with the band is still so many lamp beads damaged.

B, heating channel welding dead lights, because the lamps and lanterns sample single constantly, most companies in order to meet the needs of small quantities and sample single, by

Due to the low cost of equipment, structure and operation of the advantages of simple, heating channel has become the best production tools, however, because the use of the environment (for example:

However, because of the application environment (for example, the local temperature of the fan can not stabilize the problem) and the welding operator's operational proficiency and control of the welding speed has become a dead light

The larger problem, there is also the heating channel equipment grounding situation.

C, reflow soldering, generally this welding method is the most reliable production method, suitable for high-volume production processing, if not properly operated, will constitute a more serious consequences of the dead light, for example, the temperature is unreasonably adjusted, poor grounding of the machine.

2. Improper storage constitutes a dead light:

This problem is the most common, because after opening the package does not pay attention to moisture problems, because the sealing of the lamp beads more than the use of silica gel material, which according to a certain water absorption characteristics, after the damp lamp beads paste board, after the high temperature of the welding process silica gel will thermal expansion and contraction, gold line, chip, bracket deformation resulting in gold line displacement cracking, light point does not light phenomenon, so LED SMD light-emitting diode manufacturers advocate; LED to Stored in a dry and ventilated environment, storage temperature of -40 ℃ - +100 ℃, relative humidity at 85% below; LED lamp beads in its original packaging conditions within 3 months of use for the better, to prevent the bracket rust; when the LED bag opened, to quickly use up, at this moment the storage temperature of 5 ℃ -30 ℃, relative humidity at 60% below.

3. Chemical cleaning: do not use unknown chemical liquid cleaning LED, because that may damage the LED bead colloid appearance, and even cause colloid cracks, if necessary, please use alcohol swabs to clean in room temperature ventilation environment, the moment is best controlled in a minute wind to complete.

4. Heat dissipation structure, power supply and lamp board mismatch: because the power supply design or selection is unreasonable, the power supply beyond the maximum limit of LED can accept (super current, instant impact); lamps and lanterns of unreasonable heat dissipation structure, will constitute a dead light and premature light failure.

5. Static electricity can cause LED function failure, advocate to prevent ESD damage LED:

A, LED testing and assembly of the workforce must be with anti-static hand ring and anti-static gloves.

B, welding equipment and test equipment, work tables, storage racks, etc. must be well grounded.

C, the use of ion fans to eliminate LED in storage and assembly during the friction and static electricity.

D, the LED box with anti-static material box, packaging bags with static bags.

E, do not exist a fluke, touch the LED with your hands.

What are the characteristics of SMD LED, do you know? Ltd. for your professional explanation.

SMD LED is the meaning of external mount light-emitting diodes, SMD SMD helps to increase the output power, as well as different facilities applications. Is a solid-state semiconductor device, it can directly convert electricity into light. Its voltage is 1.9-3.2V, red light, yellow light voltage is the lowest, the heart of the LED is a semiconductor chip, one end of the chip is attached to a bracket, one end is the negative, the other end connects to the positive end of the power supply, so that the entire chip is epoxy resin encapsulated. Semiconductor wafer consists of two parts, one is a P-type semiconductor, in which holes dominate, the other end is an N-type semiconductor, in this side is mainly electrons. But when these two semiconductors are bridged together, they form a P-N junction between them. When the current through the wire act on the wafer, the electrons will be oriented to the P region, in the P region, electrons and holes compound, and then will be announced in the form of photons of energy, which is the principle of LED light. And the wavelength of light is the color of light, is composed of P-N junction data resolution.

LED English for (light emitting diode), LED lamp beads is the abbreviation of light-emitting diode LED, which is a superficial name.

SMD LED production manufacturers explain the characteristics of LED beads:

1. Voltage: LED lamp beads use low-voltage power supply, the supply voltage is between 2-4V, depending on the product, so it is a safer power supply than using high-voltage power supply; it is especially suitable for public places.

2. Current: The working current is 0-15mA, and the brightness varies with the increase of current.

3. efficiency: consume 80% less energy than incandescent lamps of the same luminous efficiency. 4.

4. applicability: very small, each unit LED small piece is 3-5mm square, so it can be prepared into various shapes of equipment, and suitable for variable environment. 5.

5. stability: 100,000 hours, light decay is 50% of the initial. 6.

6. response time: the incandescent lamp response time is milliseconds, the LED lamp response time is nanoseconds. 7.

7. to environmental pollution: no harmful metals mercury. 8.

8. color: change the current can change color, light-emitting diodes are convenient through chemical modification methods, adjusting the energy band structure and band gap of the material, to achieve red, yellow, green, blue, orange multi-color light. Such as a small current for the red LED, followed by an increase in current, can be changed in turn to orange, yellow, and finally green.