Nowadays, when installing lamps in many people's homes, in addition to the lamps used for lighting, some spotlights, such as spotlights mounted on the ceiling of the TV wall, are used. If these lights are broken, the LED spotlights What if the broken is not bright and flashing? ?
In fact, the replacement of the bulb of the spotlight is not very difficult. As long as the method is found, it is very simple to replace the bulb of the spotlight, and it is not necessary to ask the professional master to repair it, which is costly and time consuming.
First of all, we turn off the switch of the spotlight to ensure the safety when replacing. Then use a flat-blade screwdriver to pick up the outer ring. The whole lamp can be removed. After replacing the lamp, tilt the advanced side and then flatten the whole lamp.
The spotlights taken can be found in the after-sales service of the sellers. The general LED product warranty is at least two years.
Analyze the problem:
3W MR16 LED (12V (regulated input) spotlight and switching power supply (12V/2.5A), each switching power supply has 6~8pcs of spotlights, but after half a year of use, several sets of LED spotlights flicker. Sometimes, all switching power supplies are hot (more than 60 degrees), the switching power supply is placed on the flowering, and the ventilation is also OK. When testing the voltage and current, the output and input are normal. When the LED is flashing, the switching power supply has no output current. .
Possible cause analysis:
LED low-voltage spotlights are lamps that are mounted in M16 and M11 lamp cups and are directly connected to the halogen transformer electronic transformer. Since the electronic transformer is designed for halogen lamps, it is not suitable for use as a power source for LED drivers. When three LEDs are connected in series and connected to a halogen transformer, there are two problems: no light and low frequency. The rated voltage of the low-voltage halogen lamp is 12V. In order to extend the service life of the halogen lamp, the output voltage of the electronic transformer is intentionally designed to be slightly lower than the rated voltage of the halogen lamp, which is generally 11.3 to 11.5V. The conventional low-voltage LED driver is a Buck structure that requires a minimum differential voltage of 0.3V during normal operation, ie VBuck = 0.3V. If the LED's PN junction forward voltage is 3.4V, the sum of the forward voltages of the three LEDs is VF = 10.2V. The Schottky full bridge has a voltage drop of about 1V, which is VD=1V. When the input voltage VIN-(VD + VF) < VBuck, the driver will not work properly and the LED will not light up. As shown in Figure 1, the three LEDs are connected to the electronic transformer with an output voltage of 11.3V through the Buck driver. The output voltage of the driver is only 10V, which is less than the conduction voltage of the three LEDs in series, so the LED does not light up.
How to choose spotlights:
The spotlights are divided into low voltage and high voltage. Consumers should choose low-voltage spotlights, which have a longer life and higher light efficiency. The light effect of the spotlight is reflected by the power factor. The greater the power factor, the better the light effect. The power factor of the ordinary spotlight is about 0.5, the price is cheap, and the power factor of the high-quality spotlight can reach 0.99, and the price is slightly expensive. Spotlights are generally used to enhance the illumination of decorative objects. They are usually embedded in ceilings or walls. When spotlights work, they generally emit higher temperatures. Therefore, it is necessary to purchase high-quality products, otherwise there will be safety hazards. When using the spotlight, it should be used with the transformer. The lamp bead should also be of good quality. Otherwise, the lamp bead of the spotlight is very easy to break. Think about it, the spotlight lamp bead in the ceiling can be quite troublesome to replace. At present, the quality of spotlights on the market is uneven, and it is difficult to distinguish between good and bad by the naked eye. Therefore, it is best to choose brand products for the spotlights and choose a high-quality transformer.
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