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1. (WO2017156075) BUCK-BOOST CONTROLLER ACHIEVING HIGH POWER FACTOR AND VALLEY SWITCHING

Pub. No.:    WO/2017/156075    International Application No.:    PCT/US2017/021289
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Thu Mar 09 00:59:59 CET 2017
IPC: H02M 3/335
H02M 1/42
Applicants: MICROCHIP TECHNOLOGY INCORPORATED
Inventors: KRUGLY, Simon
MEDNIK, Alexander
TAN, Marc
TIRUMALA, Rohit
Title: BUCK-BOOST CONTROLLER ACHIEVING HIGH POWER FACTOR AND VALLEY SWITCHING
Abstract:
A high power-factor buck-boost converter having a rectified low-frequency AC line voltage input and a DC output is provided. The converter may include a magnetic element (103), a controlled switch (102) having a gate terminal and a drain terminal that is coupled to the magnetic element, a rectifier (diode105) coupled to the magnetic element, an output smoothing capacitor (106) coupled to the rectifier diode, and a control circuit (199) having an output coupled to the gate terminal of the controlled switch for repeatedly turning the controlled switch off for a first time duration and on for a second time duration. The second time duration may be determined as a function of the first time duration immediately preceding the second time duration.