According to the US Department of Energy report, the overall size of the US lighting market will reach $25.1 billion in 2016. The US market is the largest overseas market for Chinese companies, comparable to Europe. The US LED bulbs increased from 1.90 million in 2012 to 77.7 million in 2014, and only accounted for 2% of the US A-type bulbs. In 2014, the US A-type bulbs totaled 3.27 billion. Its market space is huge.
In this report, it is also detailed that the US LED lamp consumption has increased from 400,000 in 2012 to 2.7 million in 2014. The number of LED integrated lamps has increased from 700,000 in 2012 to 9.8 million in 2014. However, the use of LED tubes and lamps together accounted for only 1% of the total amount of tubular lamps in the United States. In 2014, the total amount of tubular lamps in the United States was 987 million, which has great growth potential.
However, due to the widespread use of electronic ballast drive in traditional lighting lines, coupled with the high cost of foreign labor, the cost of the original lighting circuit is too large, so how to design to meet the direct input requirements of the grid (PF) 0.9) LED lamps that are compatible with the output of electronic ballasts have become an urgent problem for LED companies.
If you want to be compatible with electronic ballasts, you must first understand the basic working principle.
The general electronic ballast adopts a two-stage circuit structure: the pre-stage APFC satisfies the input power factor and the THD requirement, and is generally closed-loop constant-voltage output control; the latter stage uses the LC fixed-frequency oscillation circuit to design and output the high-frequency AC signal (40-120 kHz). .
As can be seen from the above figure, the fluorescent lamp can be equivalent to the ideal resistance, so the process of normally lighting the fluorescent lamp is actually the process of changing the output gain of the LC resonance network. At the same time, it can be seen that since the electronic ballast LC oscillation circuit adopts an open-loop control mode, it is also selected for the type of the fluorescent lamp to be driven (ie, the equivalent impedance of the fluorescent lamp).
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