초록 ▼

One-stage power factor correction (PFC) with output electrical isolation. The converter has a configuration of combining a boost circuit and a forward circuit in one power stage. To relieve the voltage spike caused by the leakage inductance of the power transformer, two bulk storage capacitors are u

One-stage power factor correction (PFC) with output electrical isolation. The converter has a configuration of combining a boost circuit and a forward circuit in one power stage. To relieve the voltage spike caused by the leakage inductance of the power transformer, two bulk storage capacitors are used. The same power switch is shared by the PFC circuit and the power conversion circuit. Due to its simplified power stage and control circuit, this converter presents a better efficiency (87%), lower cost and higher reliability. Detailed steady state analysis results show this novel converter has both good power factor correction and excellent regulation capabilities. With PSPICE simulation and experimental results, a measured power factor of 0.99 was obtained by this single switch converter.

대표청구항 ▼

[ We claim:] [1.] A power supply that provides a DC(Direct Current) power to a load from an AC (Alternating Current) source comprising:a rectifying stage for transferring electrical energy from an AC source into pulsating unipolar voltage pulses at output terminals;a boost stage having a controllabl

[ We claim:] [1.] A power supply that provides a DC(Direct Current) power to a load from an AC (Alternating Current) source comprising:a rectifying stage for transferring electrical energy from an AC source into pulsating unipolar voltage pulses at output terminals;a boost stage having a controllable conducting means and a first unidirectional conducting means for controlling current flow from the output terminals of the rectifying stage and blocking the current flow into the opposite direction and a single controllable switching device connected across the output terminals; andan inductively coupled forward stage for connecting to a load; andan inductive-capacitive stage connected between said boost stage and said forward stage providing an inductive energy storing circuit when said switching device is closed and a capacitive charging circuit when said switching device is open, whereby a conversion efficiency of over approximately 80% AC to DC is achieved.