LED filament lamp design and production technology have matured in 2013, and factories producing LED filament lamps have sprung up. LED filament manufacturing technology, LED filament application technology, glass bubble sealing foam technology, and stroboscopic power supply technology have all been thoroughly researched and improved. Several incandescent lamp factories have successfully transformed and upgraded, and traditional incandescent lamp factories play an irreplaceable role. The advantage of entering the LED lighting industry.
Customers in Europe, North and South America, South Africa, Southeast Asia, and the Middle East are enthusiastic about LED filament lights, and they are willing to pay a higher price. The current export price of 3.6W A60 filament bulb has reached 4.5 US dollars, and the cost performance is much higher than other types of LED bulbs .
In December 2008, Japan's Niuwei Light Source Co., Ltd. announced the development of a practical LED filament lamp with 6 LED filaments in series, each with 3 LED dies. Therefore, 18 LED dies were used for each bulb.
The Chinese engineering community is smart and intelligent, designing LED filaments into high-voltage LED strings (HVLEDs), 26-30 LED dies bonded to a thick 1.2X0.5--1mm transparent substrate strip, using high voltage (DC50-280V) ), a small current (10-40mA) to drive the light, the LED filament lamp can emit the brightness of the low-voltage (DC3.2V), high-current (200-700mA) LED bulb of the same power, and the lamp body is only lukewarm , about 30-35 degrees Celsius.
At present, LED filament lamp products are mainly 1.8--2.4W C35 candle bulbs, 3.6--10W A60 bulbs.
The main electrical performance of the program is shown in Table 1. The power input voltage is AC180-264V, the output voltage is DC150V, and the output current is 20mA (for 4 filament bulbs), the efficiency is 91%. The bill of materials (BOM) of the program is shown in Table 2. The total number of parts is only 13 and it is a very economical and practical solution.
AC and DC voltage safety isolation
The current LED filament lamp is a combination of the LED driving power supply , the isolation plastic ring and the metal lamp cap. Therefore, the isolation plastic gasket acts as a safety isolation function for the AC and DC voltage, and is also necessary for the certification of the entire lamp over EMI. Measures. The PCB of the design constant current driving power supply has a diameter of 18 mm. The design is so small that the power source can be deeply buried in the lamp cap of the bulb, and the bulb head is all metal. As we all know, all the bulb heads are directly connected to one end of the grid during operation, and are in the AC high voltage field. The PCB of the power supply has both the AC high voltage point and the DC high voltage point, so the entire driving power source and the lamp head metal need to be The body has a safe isolation. Isolating a plastic collar is a simple, effective, low-cost solution. At the same time, due to the height of the electrolytic capacitor, the current entire power supply cannot be buried in the height of the lamp cap, and it is necessary to bury the entire power source by isolating the plastic gasket. Of course, an elongated metal base can also be designed to cover the power supply, but the safe isolation of the power supply from the inner wall of the base is still required. The LED drive power supply, the isolation plastic collar and the metal base are placed as shown.
EMI test
LED lamps need to be CE certified for export to the European market, and UL certification is required for export to the North American market.
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