1. From the perspective of the driving scheme, the LED […]
1. From the perspective of the driving scheme, the LED filament power supply is divided into three categories: resistance-capacitance step-down; linear constant current; IC constant current.
2, from the structural point of view, LED filament power supply is mainly 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
The following figure is from left to right: resistance-capacitance buck, linear constant current, IC constant current
1. Resistivity and pressure reduction: small size, low cost, constant voltage fluctuation, stroboscopic, easy to pass EMC, anti-lightning surge, difficult to pass export certification, easily damaged in areas with poor grid protection.
2, linear constant current: small size, low cost, small fluctuations in voltage range, constant flow, 30cm no stroboscopic, easy to pass EMC, large heat, easy to be damaged by heat in areas with large grid voltage fluctuations.
3, IC constant current: more components, the cost is slightly higher, voltage fluctuations, constant current accuracy, no stroboscopic, can pass EMC, the most comprehensive protection.