A power conversion apparatus and a control module. The power conversion apparatus includes: a DC/DC conversion circuit and a control module. The DC/DC conversion circuit includes an inverter circuit, a resonance unit, and a rectifier circuit. The inverter circuit includes a plurality of bridge arms, and each bridge arm includes a plurality of switching transistors. The control module is configured to: after controlling the plurality of switching transistors to operate for first duration by using a first frequency as a switching frequency, control the switching frequency to switch to a second frequency; and control the plurality of switching transistors to operate for second duration by using the second frequency as the switching frequency. The first frequency is higher than the second frequency, and the first duration is shorter than the second duration.