The invention discloses a double-tube Buck-Boost type PFC (
Power Factor Correction) converter based on one-
cycle control, a bridge rectification circuit is then connected with a BOCBB type double-tube Buck-
Boost converter; one path of output
signal of a PI (proportion integral) adjuster is sent to a noninverting input end of a
comparator, the other path of output
signal is superposed with a sampling
signal of input current and then is sent to a resettable
integrator, an output end of the resettable
integrator is connected with an inverting input end of the
comparator, an output end of the
comparator is connected with an RS (
remote sensing) trigger, one end of the RS trigger is connected with a reset switch of the resettable
integrator, and a Q-end output signal of the RS trigger simultaneously drives two switching tubes of the BOCBB type double-tube Buck-
Boost converter after passing by a
driving circuit. The converter disclosed by the invention not only can realize output
voltage raising and reducing control, but also can improve a network side
power factor, reduces the
distortion factor of network entry current, has the advantages of simple structure, high
system efficiency and the like and is convenient to control.