US 2019/0199205 A1 · QUASI-RESONANT BUCK-BOOST CONVERTER WITH VOLTAGE SHIFTER CONTROL

Abstract

The zero voltage switching quasi-resonant PFC buck-boost converter is directed to a circuit and method of operating the circuit that provides improved efficiency, decreased switching losses and operation at higher frequencies as compared to conventional bridgeless PFC buck-boost converter. The zero voltage switching quasi-resonant PFC buck-boost converter includes a buck transistor switch coupled to an input AC voltage source, a PFC transistor switch and a PFC diode coupled to an output voltage bulk capacitor, and a zero crossing detect inductor magnetically coupled to a buck-boost inductor for determining minimum voltage levels at which to turn ON the buck transistor switch and the PFC transistor switch. The zero voltage switching quasi-resonant PFC buck-boost converter with voltage shifter control addresses the problems of conventional bridgeless PFC buck-boost converters by using different voltage modes and zero crossing detection control.

Claims10

Dependent claims

A bridgeless power factor correction buck-boost converter comprising:

a first transistor switch coupled to a first node of an AC voltage source;
a first diode comprising a cathode coupled to the first transistor switch;
a first inductor coupled to the first transistor and to the cathode of the first diode;
a second transistor switch coupled to the first inductor;
a second diode comprising an anode coupled to the first inductor and to the second transistor switch;
an output capacitor coupled to a cathode of the second diode;
a second inductor magnetically coupled to the first inductor;
and
a controller coupled to control switching of the first transistor switch and the second transistor switch, wherein the controller is further coupled to the second inductor to determine zero crossing detection.

6 more elements

Dependencies are inferred from the claim text.

Quasi-resonant buck-boost converter with voltage shifter control

Life of this patent

Quasi-resonant buck-boost converter with voltage shifter control

Life of this patent

Abstract

Claims10