| CPC H02M 1/4225 (2013.01) [H02M 1/0012 (2021.05); H02M 1/08 (2013.01)] | 12 Claims |
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1. A switching control circuit for a power supply circuit configured to generate an output voltage at a target level from an alternating-current (AC) voltage inputted thereto, the power supply circuit including
an inductor configured to receive a voltage corresponding to the AC voltage,
a transistor configured to control an inductor current flowing through the inductor,
the switching control circuit being configured to control switching of the transistor, the switching control circuit comprising:
a first command value output circuit configured to output a first command value corresponding to a difference between a feedback voltage corresponding to the output voltage and a reference voltage;
a correction circuit configured to correct the first command value, to output a resultant value as a second command value;
a first timer circuit configured to measure a first time period starting from a first timing at which the transistor is turned on; and
a driving signal output circuit configured to
output a driving signal to turn on the transistor in response to the inductor current reaching a predetermined value and the first time period having elapsed since the first timing, and
output the driving signal to turn off the transistor based on the second command value, wherein the correction circuit corrects the first command value to thereby cause an on time period during which the transistor is on to increase, in a case where the first time period has elapsed since the first timing, after the inductor current reaches the predetermined value.
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