An Analysis of the Load Characteristic of the Purified Regulated Power Supply

The paper examines the effect of loading characteristic changing on the performance of the purified regulated power supply. Toward this end, the firing angle that control it have been summarized with a view toward avoiding the effect of loading characteristic changing. The method that adjust the firing angle is found , assuming an equal conduction angle of thyristors in the two half periods and the voltage waveform is sinusoidal. In the control of the regulated power supply, the output voltage is not unstable in a definite range. The change of load characteristic is a key factor for it. At the case of three kinds of loading, the calculation formulas of output voltage are derived. When the input voltage is quantitated , the influences of loading to the regulated power supply are manifested. Based on the hypothesis of loading characteristic change, the general changing rule of the output voltage have been investigated. At last, follow the example of resistor loading, the phased controlled rule is pointed.