90_V_rms_VOLTAGE_REGULATOR_USING_A_PUT

Published:2009/7/2 5:23:00 Author:May | From:SeekIC

Circuit Notes The circuit is an open loop rms voltage regulator that will provide 500 watts of power at 90 V rms with good regulation for an input voltage range of 110-130 V rms. With the input voltage applied, capacitor C1 charges until the firing point of Q3 is reached causing it to fire. This turns Q5 on which allows current to flow through the load. As the input voltage increases, the voltage across RIO increases which increases the firing point of Q3. This delays the firing of Q3 because C1 now has to charge to a higher volt-age before the peak-point voltage is reached. Thus the output voltage is held fairly con-stant by delaying the firing of Q5 as the input voltage increases. For a decrease in the input voltage, the reverse occurs.



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