Ella Cheong Hong Kong
Battery charger with power factor correction
A battery charger with power factor correction is provided. In particular, the battery charger is configured to work in a discontinuous current mode with a power factor that is almost unity but no bulky electrolytic capacitor is needed in the charger. The charger has a rectification circuit producing a rectified voltage to a first controllable switching circuit, whose output is fed to a series resonant tank series-connecting a first winding of a high-frequency transformer. The second winding thereof is connected to a second controllable switching circuit, whose output is a DC voltage for battery charging. The charger includes a control unit for generating a first control signal and a second control signal to control the first and the second controllable switching circuits, respectively, such that the current flowing in the first winding is substantially phase-aligned with the first control signal's waveform, thereby facilitating power factor correction.
Macau University of Science and Technology
H Y H H Y H H H H H
H02M Y02B H02M H02J Y02B H02J H02M H02M H02M H02J
inventional additional inventional additional additional inventional inventional inventional inventional inventional
Xiaodong Song
Li Hu