Analysis And Design Of Electronic Ballast Circuit Of The Central Molecule

As an important energy-saving production, the high-frequency electronic ballast is more and more attracted in many countries. Many International states have made fluorescent lamp ballast using Smart Power Integrated Circuit.(SPIC), such as IR corp.'s IR215X series productions. The advantage of SPIC is high-reliability, but the high-cost will be a bottleneck to progress. In our project, we use the patent of XingBi Chen, not using the method of medium insulation or pn junction insulation (that is not using international BCD technology). We use the method to make high-voltage (power) device and low-voltage CMOS circuit or BiCMOS circuit in a chip, which makes the cost of SPIC falling.In this paper, we have deeply researched soft-startup electronic ballast. The soft-startup is that we use a larger by larger current to preheat the filament to avoid the current striking to filament and extent the lamp's life. The primary work is to analyze and solve the problem that found in fabrication:Have analyzed the problem that the output voltage of the reference circuit in fabrication is lower than the designed value and is sensitive to the supply and have found the relationship between the output voltage and some critical parameter and have improved the circuit topology to less sensitive to the supply and temperature;Have analyzed the problem that the frequency generated by the pulse circuit is sentive to the supply and have improve the circuit that made the frequency more stable and the ignition frequency lower than the run frequency;Have analyzed the NPN transistor that is critical to the over temperature protection circuit and have designed a low bus voltage protection circuit that si useful to reset the pulse circuit.In last, we have designed the whole circuit's layout, checked the layout and production in the 58 Institute. Through analyzing the testing result, we sum up the experience in our work.