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With economic developing, environmental protection and sustainable development is paid more and more attention by people. Specially in part of domestic lighting, HID lamps are widely applied in residential as well as commercial application due to its impressive performance such as high luminous efficiency, long life, color rendering. HID is included in the project of saving energy. And With manufacture developing and performance improvement, performance of ballast will be higher, for example, high-power stage, high-frequency and high-efficiency.Power factor is the percentage of power in the apparent power. In the electric power system, the improvement of power factor is important. It is connected with energy loss and economy. To the user, the higher power factor is, the less the reactive power is. To the power line, the less the harmonic is, the more the saving energy is. Such as that, the power line is clear and other devices would not be influenced.The digital signal process is developing now. The way of digital control to the power electric would be improved. In fact, digital control is a necessary method to realize not only power miniaturization, but also high-precision, steady work, high efficiency.This page does some work to digital control, as follows:1, Building mathematic modeling, and find the transfer function of PFC.2, To this modeling, SIMULINK toolbox in MATLAB is used to prove it validity. Anticipant result is gotten by adjusting the parameter of P and I.3, 200W Boost-PFC is built, and PCB of signal converter and DSP are also built. These PCB is for proving if the modeling is correct.
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