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AN2747 Datasheet(PDF) 10 Page - STMicroelectronics |
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AN2747 Datasheet(HTML) 10 Page - STMicroelectronics |
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10 / 44 page  General circuit description AN2747 10/44 Equation 1 where ● VL= lamp voltage ● Vdc = DC bus voltage ● Vlamp = lamp voltage b) When the high side device H1 is switched OFF, the current flows in the low side devices. The freewheeling diode integrated in the low side device IGBT L1 operates at high frequency with duty cycle 1-D (see Figure 10). Figure 10. Inductor current during discharge phase The voltage across the inductor is: Equation 2 The current through L decreases linearly. This circuit is actually a synchronous rectifier buck converter. To minimize the current ripple through the lamp, the circuit operates in continuous conduction mode (CCM) with fixed frequency. The circuit operates in mode A and B complementarily in low frequency supplying the lamp with square wave alternate current. 2.2 Lamp power management The lamp power is obtained by multiplying the lamp voltage signal and the lamp current. The lamp voltage is sensed directly across the lamp while the lamp current is obtained using the relation given below. In continuous mode the lamp current is coincident with average buck coil current. Starting from peak inductor current the average value is: Equation 3 V L V dc V lamp – = Lamp H2 H1 L2 L1 DC Bus OFF ON I L V L V lamp – = I lamp I AV I peak I ∆ 2 ----- – = = |
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Similar Description - AN2747 |
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