Fuser system and heat source power circuit

摘要

A printing system fuser is presented with an AC-AC power circuit using a pair of high speed pulse width modulated switches and low speed switching devices for flyback current conduction for powering a fuser heating element, and power factor control system and techniques are presented for adapting AC-AC converter control for powering one fuser heating element at least partially according to angle control switching of another fuser heating element to control fuser power factor.