A photovoltaic module comprising: a solar cell module including a plurality of solar cells; a converter configured to convert a level of a DC power input from the solar cell module; a DC-terminal capacitor configured to store DC power output from the converter; an inverter configured to convert the DC power into an AC power; and a controller configured to control the inverter, wherein the controller is configured to perform asynchronous pulse width modulation control for the inverter, and to control a switching frequency of at least some switching elements in the inverter to be changed for a period including a maximum point (pka) with a corresponding voltage (Vpka) or a minimum point (pkb) with a corresponding voltage (Vpkb) of the AC power output from the inverter, wherein the converter includes: a full-bridge switching device configured to switch the DC power; a transformer having an input side connected to an output terminal of the full-bridge switching unit; a synchronous rectifier connected to an output side of the transformer; and a resonant capacitor (Cr) and a resonant inductor (Lr) connected between the transformer and the synchronous rectifier, and the controller is configured to change a switching frequency of the full-bridge switching unit based on an input voltage of the converter or a voltage of the DC-terminal capacitor, wherein the controller is configured to control the full-bridge switching unit to operate in a buck mode, and the full-bridge switching unit and the synchronous rectifier to operate at a first switching frequency when a voltage of the DC-terminal capacitor is a target voltage or more, and to control the synchronous rectifier to operate in a boost mode, and the full-bridge switching unit and the synchronous rectifier to operate at a second switching frequency lower than the first switching frequency when the voltage of the DC-terminal capacitor is lower than the target voltage. a solar cell module including a plurality of solar cells; a converter configured to convert a level of a DC power input from the solar cell module; a DC-terminal capacitor configured to store DC power output from the converter; an inverter configured to convert the DC power into an AC power; and a controller configured to control the inverter, wherein the controller is configured to perform asynchronous pulse width modulation control for the inverter, and to control a switching frequency of at least some switching elements in the inverter to be changed for a period including a maximum point (pka) with a corresponding voltage (Vpka) or a minimum point (pkb) with a corresponding voltage (Vpkb) of the AC power output from the inverter, wherein the converter includes: a full-bridge switching device configured to switch the DC power; a transformer having an input side connected to an output terminal of the full-bridge switching unit; a synchronous rectifier connected to an output side of the transformer; and a resonant capacitor (Cr) and a resonant inductor (Lr) connected between the transformer and the synchronous rectifier, and the controller is configured to change a switching frequency of the full-bridge switching unit based on an input voltage of the converter or a voltage of the DC-terminal capacitor, wherein the controller is configured to control the full-bridge switching unit to operate in a buck mode, and the full-bridge switching unit and the synchronous rectifier to operate at a first switching frequency when a voltage of the DC-terminal capacitor is a target voltage or more, and to control the synchronous rectifier to operate in a boost mode, and the full-bridge switching unit and the synchronous rectifier to operate at a second switching frequency lower than the first switching frequency when the voltage of the DC-terminal capacitor is lower than the target voltage. a full-bridge switching device configured to switch the DC power; a transformer having an input side connected to an output terminal of the full-bridge switching unit; a synchronous rectifier connected to an output side of the transformer; and a resonant capacitor (Cr) and a resonant inductor (Lr) connected between the transformer and the synchronous rectifier, and the controller is configured to change a switching frequency of the full-bridge switching unit based on an input voltage of the converter or a voltage of the DC-terminal capacitor, wherein the controller is configured to control the full-bridge switching unit to operate in a buck mode, and the full-bridge switching unit and the synchronous rectifier to operate at a first switching frequency when a voltage of the DC-terminal capacitor is a target voltage or more, and to control the synchronous rectifier to operate in a boost mode, and the full-bridge switching unit and the synchronous rectifier to operate at a second switching frequency lower than the first switching frequency when the voltage of the DC-terminal capacitor is lower than the target voltage.