Classification, characteristics, and comparison of various types of schemes from LED filament lamps. Let you really understand all aspects of LED filament drive technology.
First, LED filament drive classification
1. From the perspective of the driving scheme, the LED filament power supply is divided into three categories: resistance-capacitance buck; linear constant current; IC constant current.
2, from the structural point of view, LED filament power supply is divided into two categories: all glass without plastic parts; with plastic parts. Among them, there is no need to distinguish the type of lamp, such as E26/E27/B22; E14/E17 is another.
Second, the main features of three kinds of LED filament drive solutions
1. Resistive capacity and voltage reduction: small size, low cost, constant voltage fluctuation, stroboscopic, must pass EMC
2, linear constant current: small size, low cost, small fluctuations in voltage range, 30cm no stroboscopic, must pass EMC
3, IC constant current: large size, high cost, constant voltage flow constant current accuracy, no stroboscopic, can pass EMC
Three, three kinds of LED filament drive solutions all-round comparison
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Fourth, the general parameters of LED filament drive
1, candle light 2W, 3W, 4W output voltage is 150V, output current is 12mA, 17mA, 24mA
2, bulb 2W, 4W, 6W output voltage is 150V, output current is 12mA, 24mA, 36mA
Five, LED filament and filament drive standardization recommendations
At present, the specifications of LED filaments are not uniform. Some filaments are 75V, 10mA; some are 65V, 10mA; when sealing, some are 2 strings, some are 1 string, which is not convenient for ordering and stocking of filament and drive.
The characteristics of the two options of comprehensive resistance and IC constant current.
It is recommended that you use a 75V, 10mA filament and do 2 strings when sealing.
On the one hand, the current is small, the loss is small, the power supply efficiency is high, and the whole lighting effect is high; on the other hand, it is also convenient for standardization and inventory production. In particular, the latter can solve the current unfavorable situation of filament drive, because of the large number of styles, the inability to prepare inventory, and the long delivery period.
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