Patent ID: 7859863

Claim:
A single-stage power factor correction circuit, comprising: a first rectifier, said first rectifier having a first end coupled to a line input terminal and a second end; a second rectifier, said second rectifier having a first end coupled to a neutral input terminal and a second end coupled to the second end of said first rectifier; a full bridge rectifier, said full bridge rectifier comprising a third rectifier, a fourth rectifier, a fifth rectifier and a sixth rectifier, said third rectifier and said fourth rectifier and said fifth rectifier and said sixth rectifier each having a positive electrode at one end and a negative electrode at an opposite end, said third rectifier having the positive electrode thereof coupled to said line input terminal, said fourth rectifier having the negative electrode thereof coupled to said line input terminal, said fifth rectifier having the positive terminal thereof coupled to said neutral input terminal, said sixth rectifier having the negative terminal thereof coupled to said neutral input terminal; a capacitor, said capacitor having a first terminal coupled to the second end of said second rectifier and a second end coupled to the positive electrode of said fourth rectifier and the positive electrode of said sixth rectifier; a transformer, said transformer comprising a first primary coil, a second primary coil and a first secondary coil, said first primary coil having one end coupled to said capacitor, said second primary coil having one end coupled to the negative electrode of said third rectifier and the negative electrode of said fifth rectifier; and a switch, said switch being a three-terminal component having a first terminal coupled an opposite end of said first primary coil and an opposite end of said second primary coil, a second terminal coupled to a control signal, and a third terminal coupled to said capacitor, for receiving said control signal to turn on or off a circuit.