5_V_40_A_20_kHz_SWITCHED_MODE

Published:2009/7/14 3:11:00 Author:May | From:SeekIC

Uses Motorola 2N6544 power transistors operating with 3-A collector current (other half of power stage is identical). Bridge rectifier and capacitive filter connected directly to AC line form 150-VDC sup-ply for inverter operating at 20 kHz. Regulators MC7806 and MC7906 operating from MDA9221 bridge rectifier of 15-W filament transformer T3 provide ±6 V for logic circuits that provide pulse-width modulation for inverter. When logic signal is high, MPS-U51 saturates and supplies 1 A to base of 2N6544 inverter power transistor When logic is low, MPS-U95 Darlington holds inverter transistor off.-R. J. Haver, Switched Mode Power Supplies-Highlighting a 5-V, 40-A Inverter Design, Motorola, Phoenix, AZ, 1977, AN-737A, p 10.



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