| Popis: |
This paper presents the analysis, control strategy and realization of a digital frequency controller of a two stage ballast for HID Lamps. First, the small signal phasor model of the LC S C P resonant inverter is established and verified. Based on this model, a dobule loop digital compensator is desigened to control the current and power of the lamp. Then the overall control strategy for the long term stability of the ballast is designed and realized on a PIC MCU controller. Finally, a electronic ballast for a 400W MH lamp is designed based on this scheme, and the experimental results are provided. |
