LED light producing method and circuit diagram

A SMD LED bulbs production data and SMD leds include SMD LED bulbs production circuit diagram of simple production process, here are 10 SMD leds making circuit diagram:

figure 1 is a practical circuit diagram of the SMD LED lighting lamps and lanterns, the light use 220 v power supply, the 220 v alternating current (ac) after C1 step-down capacitance step-down by C2 again after the whole bridge rectifier filter after the current limiting resistor R3 provide series of 10 strips LED constant current power supply. Rated current of the SMD LED to 20 ma, but we in the production of energy-saving lamps to consider many factors influence on SMD leds, including droop and fever, the temperature of the LED light failure and life influence is very big, if you are easy to produce light failure, because the temperatures are the characteristics of the LED current will increase, so the general was in a high power lighting heat dissipation problem is one of the most important, will affect the stability of the LED, low power generally adopt the mode of the heat dissipation, so shoulds not be too great electric current in the circuit design. Figure of resistor R1 is protection, R2 is put resistor capacitor C1 discharge, R3 is to prevent the resistor voltage increases and rising temperature LED current, C2 is filter capacitance, actual in LED circuit can need not filter circuit, the impact of C2 is used to keep turn on the light when the damage to the LED current, turn on the light of the moment because of the existence of C1 will have a large charging current, the current through the LED will produce damage to the LED, with the intervention of C2, turn on the light of the charging current is completely absorbed by the C2 to turn on the light anti impact protection. This circuit is the most practical circuit, small power lamp cup occupies small volume can be installed in the space is lesser lights cup, now widely adopted by light cup products. Advantages: constant current source, small power consumption, small size, economic and practical. But the step-down condenser pressure must be used in the design of polyester in more than 400 v electric or CBB capacitance, filter capacitor voltage 250 v or more. This circuit is suitable for driving - 7 12 of 20 ma SMD leds.

figure 2 is a circuit board diagram PCB

figure 2 of this circular board handmade more troublesome, suggest to buy the finished plate.

the following to introduce the production process

figure 3 will light plate tin, attention must be uniform, tin not too thin nor too thick.

production tools ( See figure 4)

needle nose pliers or diagonal cutting pliers, air-conditioning electric grounding line, anti-static bracelet, nail clippers, the high quality fine solder wire, high-quality rosin, AB glue, it is better to have a dc ammeter 50 ma ( Can't use multimeter to replace) 。

select SMD LED

SMD LED to choose high brightness, brightness 5500 - product 6000MCD( Pure white light) , voltage: 3. 2 - 3. : 4 v, current 20 ma, the welding temperature 250 light Angle 120 color temperature 5500 k. Welding and installing patch LED:

install circuit board face up, put good SMD LED polarity direction, pay attention to the SMD leds have a positive Angle has a gap, gaps foot for the positive ( A total of 6 feet) , installation direction should agree, don't put wrong because the SMD leds is unidirectional conductivity and the circuit is used in series circuit, so long as there is an upside the whole lamp will not light.

6 foot for good just of tin, fixed patch LED by hand can be after welding, the welding with a 30 - 35 w iron and ground wire, welding temperature control within the 240 - degree, time can't more than 2 seconds. This lamp plate even if assembly is complete. ( FIG. 5)

the image and then assemble the power, the power of the welding easier success as the chart, because space is limited in lamp cup, element to do just that in order to reduce volume and convenient installation. ( Figure 6)

power and light board can connection test after welding.

have a look at, whether very bright ah, ha ha

do the current test

test current for 14 ma, can meet the requirements.

began to assemble finished patch below the LED lamps and lanterns, small power panel, there is a small cylindrical Angle in lamp cup, insert the power supply board of small cylindrical holes are aligned, with electric heating cylinder is fixed more firmly.

with good AB glue finally figure at the edge of the lamp cup to put light plate in a few minutes of glue curing pressure. Such a practical SMD LED bulbs are made ready to use.

make considerations for SMD leds is very sensitive to static electricity, static electricity is easy to cause damage to SMT LED, light performance degradation, or SMD leds reverse breakdown caused by short circuit, so when the contact patch LED must be electrostatic protection, wear anti-static hand ring, use antistatic soldering pen, ordinary iron must ground wire. Conditional still need to use the radio antistatic mat.

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