Power conversion device and control method thereof

A control method for a power conversion device, wherein the power conversion device comprises a power factor correction circuit, an LLC converter, and a controller;

• the LLC converter is coupled to the power factor correction circuit, and the controller is coupled to the power factor correction circuit and the LLC converter;
• the power factor correction circuit outputs a direct-current voltage and a ripple voltage associated with the direct-current voltage, the LLC converter receives the direct-current voltage to output an output current, the controller receives the ripple voltage from the power factor correction circuit, the control method comprising the following steps:
• the controller generating a plurality of switch control signals for the LLC converter according to the ripple voltage and the output current;
• and
• the controller compensating the output current according to the ripple voltage to adjust the plurality of switch control signals.