Controlling circuit and AC/DC converter thereof

摘要

In one embodiment, a controlling circuit configured for an AC/DC converter that receives an AC voltage supply, can include: (i) a compensation signal generator configured to generate a compensation signal that follows an error between an output signal from the AC/DC converter and an expected converter output signal during a first time interval of a half period of the AC voltage supply, the compensation signal being substantially constant during a remaining time interval of the half period; and (ii) a controlling signal generator configured to generate a controlling signal based on the compensation signal to maintain the output signal as substantially consistent with the expected converter output signal.

主权项

1. A controlling circuit configured for an AC/DC converter that receives an AC voltage supply, the controlling circuit comprising:
a) a compensation signal generator configured to generate a compensation signal that is consistent with and follows an error between an output signal from said AC/DC converter and an expected converter output signal during a first time interval of a half period of said AC voltage supply, wherein said output signal is lower than a reference level only during said first time interval; b) a charging capacitor configured to maintain said compensation signal as substantially constant at a same value as at the end of said first time interval during a remaining time interval of said half period, wherein said output signal is higher than said reference level only during said remaining time interval; and c) a controlling signal generator configured to generate a controlling signal based on said compensation signal to maintain said output signal as substantially consistent with said expected converter output signal.