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500_W_AT_20_kHz

2014-11-08 05:20  
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500_W_AT_20_kHz
Uses four Delco DTS-712 transistors in push-pull Darlington configuration, with pulse-width modulation on push-pull inverter providing regulation. Can be operated from 220-VAC three-phase full-wave rectified line. Efficiency is up to 80%. Square-wave output of 40-kHz primary oscillator drives JK flipflop that generates complementary square waves and divides frequency by 2 with necessary symmetry. NAND gates establish primary ON/OFF periods of power stage. Portion of output signal is compared to reference voltage, and error signal is fed to NAND gates to give regulation better than 0.1% for load range of 200-500 W or line range of 300-400 V.- A 20 kHz, 500 W Regulating Converter Using DTS-712 Transistors, Delco, Kokomo, IN, 1974, Application Note 55.