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Switching power supply and AC waveform generation method in switching power supply
Switching power supply and AC waveform generation method in switching power supply
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机译：开关电源及开关电源中交流波形的产生方法
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摘要
The present invention relates to a PFC switching power supply which can perform polarity determination and voltage detection of AC voltage without using a DC isolator such as a transformer. Included are: a power factor correction section which rectifies AC voltage inputted, outputs DC voltage to a load and corrects a power factor; an input voltage detecting section which outputs L pole detected voltage and N pole detected voltage; and a switching controller which controls the operation of the power factor correction section. An AC waveform generating section of the switching controller generates an AC waveform. The switching controller generates a drive pulse having a frequency and a duty ratio varying depending on AC waveform, whereby a predetermined level of the DC output of the power factor correction section is maintained and in addition, the power factor is corrected.
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