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U.S. Department Of Energy (DOE) Energy Star (EnergyStar) Solid-state Lighting (SSL) Specification Require Any Power Level Are Mandatory To Provide Power Factor Correction (PFC)

By: DeRun   Views:5840   Date: 05/27-2013

U.S. Department of Energy (DOE) Energy Star (EnergyStar) solid-state lighting (SSL) specification require any power level are mandatory to provide power factor correction (PFC). This standard applies to a series of specific led products, such as led Downlights, Cabinet Lights and lamps, which, residential application LED driver power factor must be greater than 0.7, and commercial applications shall be greater than 0.9; However, this standard is a voluntary standard. EU IEC61000-3-2 harmonic content standards provides total harmonic distortion performance of a power greater than 25W lighting applications, the maximum limit is equivalent to the total harmonic distortion (THD) <35%, power factor (PF) > 0.94.

Although not all countries are absolutely mandatory to improve the power factor lighting applications, but some applications may have requirements in this regard, such as public utilities vigorously promote products with high power factor in the utilities business applications, in addition, utilities institutions to purchase / maintenance of street lights, can also according to their wishes to decide whether to require high power factor (typically> 0.95 +).

PFC techniques include passive PFC Active PFC. The passive PFC scheme larger, the need to add additional components to change the current waveform, it is possible to achieve a power factor of about 0.8 or higher. Less than 5W to 40W lower power applications, almost the standard selection flyback topology requires the use of passive components and minor circuit changes, you can achieve a power factor higher than 0.7.

Active PFC (see Figure 6) is usually added to the circuit as a dedicated power conversion section to change the input current waveform. Active PFC typically provide a boost PFC output voltage range of AC 100 to 277VAC wide input range of 450 to 480Vdc DC. If appropriately designed the PFC section can provide the energy efficiency of 91% to 95%. But increases the active PFC, still need a dedicated DC-DC converter to provide a current steady flow.

The energy efficiency of LED lighting applications require a combination of power output to consider. The specification of the U.S. “Energy Star” solid-state lighting lighting equipment level energy efficiency, but does not involve a separate LED driver energy efficiency requirements. As mentioned above, AC-DC power LED applications can use the two-stage distributed topology, it may use an external AC-DC adapter power supply.

“Energy Star” does contain a single output external power supply specification, the version 2.0 external power supply specification began to take effect in November 2008, 87% of the minimum energy efficiency standard operating mode, and the low pressure operating mode minimum energy efficiency up to 86 %; this specification requires only power greater than 100W PFC.

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