Schematic diagram of IR2130 used in 1kw high pressure mercury lamp ballast system

Application in ikW high-pressure mercury lamp ballast system; Figure 12.44 shows the schematic diagram
of IR213D used in an ikW high-pressure mercury lamp ballast system . In the figure, IR2130 is not only used to drive four I(;BT tubes in a single-phase full-bridge inverter, but also used to drive the chopper on the high-voltage side. The three-phase AC input becomes The 510V DC voltage is chopped and filtered by this chopper and then provided to the subsequent circuit. The output of the single-phase inverter directly drives the ikW bulb. In this system, the operating frequency of the IGBT is 25kHz. Since the high-pressure mercury lamp operates normally A constant current source is required, so the UC3843 PWM integrated circuit works as a current mode. In the figure, the field effect transistor VF. is added to meet the negative logic working needs of IR2130 . In this system, the filter is only is iptF, so the actual duty cycle of the input voltage of the full-bridge inverter is 50%. A great advantage brought by this is that although the maximum interlock time inside the IR 2130 is only 2Kn, even if In case of instantaneous load short circuit, the power IGBT will not be burned because the main circuit works as a constant current source.