A simple scheme for unity powerfactor rectification for high frequency ac buses
Abstract
A simple scheme is proposed for offline unity power factor rectification for highfrequency ac buses (20 kHz). A bandpass filter of the seriesresonant type, centered at the line frequency, is inserted between the line and the fullwave rectified load. The Q = Z0/RL formed by the load and the characteristic impedance of the tank circuit determines the power factor, the boundary between continuous and discontinuous conduction modes, the peak stresses, and the transient response of the rectifier. It is shown that for Q greater than 2/pi the rectifier operates in continuous conduction mode and the output voltage is independent of the load. Also, it is shown that for Q greater than 2 the line current is nearly sinusoidal with less than 5 percent thirdharmonic distortion and the power factor is essentially unity. An increase in Q causes an increase in the peak voltages of the tank circuit and a slower transient response of the rectifier circuit. The dc, smallsignal, and transient analyses of the rectifier circuit are carried out, and the results are in good agreement with simulation and experimental results.
 Publication:

IEEE Transactions on Power Electronics
 Pub Date:
 January 1990
 DOI:
 10.1109/63.46002
 Bibcode:
 1990ITPE....5...77V
 Keywords:

 Alternating Current;
 Bus Conductors;
 Computerized Simulation;
 High Frequencies;
 Power Factor Controllers;
 Rectifiers;
 Electric Bridges;
 Electrical Impedance;
 Equivalent Circuits;
 Waveforms;
 Electronics and Electrical Engineering