Power factor control arrangement for an ols based on quarter cycle averaged power flow.

摘要

A power factor control system for a rectifier (205) generates estimators of control input parameters (a peak squared input AC voltage E2_m and load power) and uses these substantially ripple free signals to control a boost, buck, buck-boost, SEPIC or other related type converter (230) at the input to the rectifier. The generation of these parameters allows the derivation of a programmed current ip (output of 221) which is used to control the wave form of the actual input current. The control procedure is based on a quarter cycle averaged power basis. The input power is derived from the rms values of the input voltage and current. Given the output power and its deviations in power due to load changes, the programmed current ip is determined by deriving an input conductance of the rectifier and combining it with the input voltage. <IMAGE>