SWITCH CONTROL DEVICE, POWER SUPPLY DEVICE COMPRISING THE SAME AND DRIVING METHOD OF POWER SUPPLY DEVICE

摘要

The present invention relates to a switch controller, a power supply including the same, and a driving method thereof. An AC input of the power supply is connected to a rectification circuit. The power supply includes a power switch to which the AC input passed through the rectification circuit flows during a turn-on period of the power switch and a switch controller detecting a half-on time point that is an intermediate time point of the turn-on period, calculating the AC current using a result of sampling a sense voltage that depends on a current flowing to the power switch during the turn-on period at the half-on time point and the turn-on period, and controlling the input current to have a reference wave.

主权项

1. A power supply comprising:
a rectification circuit coupled to an AC input; a power switch configured to receive an AC input current that is passed through and rectified by the rectification circuit during a turn-on period of the power switch; and a switch controller configured to detect a half-on time point, the half-on time point corresponding to an intermediate time point of the turn-on period of the power switch, and calculate the AC input current based on the turn-on period and a result of sampling a sense signal that depends on a current flowing to the power switch at the half-on time point, the switch controller further being configured to control the AC input current to have a reference wave.