| Abstract |
A new unity-power-factor converter with double PWM (pulsewidth modulation) control is presented.
The converter consists of two PWM converter circuits in parallel: the main and auxiliary converter
circuits. The main converter circuit, which is a boost converter controlled at relatively low
frequencies, transfers almost all the power to the dc load. The auxiliary converter circuit, on the other
hand, has a lower-power but higher-speed switching device and compensates the remainder that the
main converter circuit leaves. Consequently, this double PWM converter acts as a converter with the
power aspect determined by the main converter circuit and the frequency aspect determined by the
auxiliary converter circuit. Steady-state and transient performance of the proposed converter are
discussed. Experimental and simulation results show the usefulness of this converter. |
