OSRAM QTP 2×26/32/42CF/UNV/DM ballast adopts a 2-stage power supply scheme, the front stage boost + rear stage <br>half bridge, the front stage boost is used to boost the input voltage from 120-277V to about 450V as the rear stage <br>Input and realize power factor correction, the latter stage half bridge acts as a resonant output high-voltage starting lamp and <br>outputs a constant high-frequency current in a steady state .
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