With the development of LED technology , LED applications have expanded from traditional low-power portable product backlights to medium- and high-power indoor lighting , outdoor lighting and flashlight applications. Depending on the driving power supply, LED lighting can usually be divided into AC-DC LED lighting, DC-DC LED lighting power supply and battery-powered LED flashlights. LED lamps and their power are also available. Different, such as 3WPAR16, 3×2 WPAR20, 10W/15WPAR30, 15W/22WPAR38, 1WG13, 3WGU10, 1WMR11, 3WMR16, 3W/9W/15W downlight, 1W-3W reading lamp, etc.
1, AC-DCLED lighting solutions
ON Semiconductor offers a wide range of off-line controllers and power factor correction (PFC) controllers for AC-DC power-provided LED lighting applications, with different LED applications for isolation and non-isolation requirements. In isolation applications where there is no physical electrical connection between the AC line voltage and the LED, common topologies are flyback and dual inductor plus single capacitor (LLC) half-bridge resonance. Different topologies are suitable for different power ranges or for special design requirements. For example, the flyback topology is the standard choice for medium to low power applications of less than 100W, while the LLC half-bridge topology is the preferred solution for high power and energy efficiency.
Figure 1: Isolated topology with different power ranges
In AC-DCLED lighting applications, low-power LED applications are typically driven with constant current (CC), while constant voltage (CV) functions are used as protection functions in the case of open outputs. High-power LED applications may require the addition of power factor correction (PFC) in the circuit, where both the AC-DC conversion and the LED-driven two-part circuit may be in an integral configuration, ie, the two are fused together and are located in the illumination. Within the luminaire, a distributed configuration can also be used, as shown in Figure 2, to simplify security considerations and increase system flexibility.
Figure 2: Distributed configuration of high-power LED drivers
From the specific power range of the application, the application of AC-DCLED lighting power solutions mainly includes:
1W-8W: G13/GU10/PAR16/PAR20 lighting
8W-25W: PAR30/PAR38 lighting
50W-300W: area lighting
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