Bridgeless boost converter with PFC circuit

摘要: A boost type power supply circuit for providing a DC output voltage comprising first and second semiconductor switches coupled between respective input lines common connection; an AC from source being supplied across the lines; diodes in series with ones of switches; third fourth free-wheeling relationship inductance at least one controller controlling conduction times by pulse width control signal to each wherein turns on during positive half cycle allow energy storage off switch stored be attached load through or diodes; negative diodes. The determines on-time off-time modulated voltage, controlled regulate said provide factor correction based either sensing current sensing.