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LB1991V Scheda tecnica(PDF) 6 Page - Sanyo Semicon Device |
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LB1991V Scheda tecnica(HTML) 6 Page - Sanyo Semicon Device |
6 / 7 page LB1991V No.5792-6/7 Overlap Generation and Calculation Method 0 VXL VS VS A CD B VS−VXH V α VN V β 180 ° VXH VS−VXH O.L ×( −VXH) VS 2 −VXH VS 2 VXL VXL Upper side residual voltage Upper side clamp potential Electrical angle Lower side residual voltage Lower side clamp potential Time Absolute voltage Calculated center point Overlap Generation Since the voltage generated in the amplitude control block is, taking the center point as the reference, 2 × <overlap> × (1/2 VS − VX) on one side, the intersection point of the waveform will be <overlap> × (1/2 VS − VX) from the center point. To clamp that waveform at (1/2 VS − VX) referenced to the center point the overlap must be: A/B × 100 = <overlap> × 100 (%). Overlap Calculation • Upper side overlap Calculated center point: VN = (VS − VXH − VXL) 2 + VXL = (VS − VXH + VXL) 2 Since A = V α − VN, B = VS − VXH − VN, the upper side overlap will be: <overlap> = A B = V α − ((VS − VXH + VXL)/2) VS − VXH − ((VS − VXH + VXL)/2) ×100 Which can be calculated as: = 2V α − (VS − VXH) − VXL (VS − VXH) − VXL ×100(%) • Lower side overlap Since C = VN − Vβ, and D = VN − VXL, the lower side overlap will be: <overlap> = C D = ((VS − VXH + VXL)/2) − Vβ ((VS − VXH + VXL)/2) − VXL ×100 Which can be calculated as: = (VS − VXH) + VXL − 2Vβ (VS − VXH) − VXL ×100(%) |
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