Method of Obtaining Three Tightly Regulated Levels Out of Two Pulse-Width Modulation Power Trains Using Pulse-Position Modulation
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
This article describes a technique for super-position of two pulse- width modulation (PWM) power trains to obtain a third tightly regulated train and the use of phase shifting to control its DC voltage. In the technique disclosed in a multilevel, multi-train power system, the number of post-regulators can be drastically reduced or eliminated so that a substantial number of space- and power-consuming devices are eliminated. The technique is illustrated in the block diagram of Fig. 1. Referring to Fig. 1, PWM systems A and B shown as blocks 1A and 1B, respectively, are standard PWM power trains which have respective voltage outputs Va(t) and Vb(t) of period T, as shown in Figs. 2 and 3.