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FLC01-200H Datasheet(PDF) 4 Page - STMicroelectronics |
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FLC01-200H Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 8 page FLC01-200x 4/8 Rs Ds c D Th Z R Ic AC MAINS Ic t FLC01-200x Fig. 2: BASIC APPLICATION The applications of the lighter using the capacitance discharge topology operate in 2 phases : PHASE 1 The energy coming from the mains is stored into the capacitor C. For that, the AC voltage is rectified by the diode Ds. PHASE 2 At the end of the phase 1, the voltage across the capacitor C reaches the avalanche threshold of the zener. Then a current flows through the gate of the thyristor Th which fires. The firing of the thyristor causes an alternating current to flow through the capacitor C. The positive parts of this current flow through C, Th and the primary of the HV transformer. The negative parts of the current flow through C, D and the primaty of the HV transformer. The maximum Rs value is equal to : Rs VV T T kI AC BO amb BO max ( min. ) [ max .( .( ))] .* = −+ − 21 25 α * : see fig 1 RS RESISTOR CALCULATION The Rs resistor allows, in addition with the capacitor C, the spark frequency to be adjusted and the current from the mains to be limited. Its value shall allow the thyristor Th to fire even in the worst case. In this case the system must fire with the lower RMS mains voltage value while the breakdown voltage and current of the FLC are at the maximum. |
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