Patent ID: 11936303
Assignee: FUJI ELECTRIC CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A power conversion device comprising:
a first bridge circuit including a first leg including a first upper arm and a first lower arm, a second leg including a second upper arm and a second lower arm, and a resonance capacitor provided between the first leg and the second leg;
a second bridge circuit connected to the first bridge circuit via a transformer; and
a controller configured to control switching of the first bridge circuit and the second bridge circuit,
wherein the controller is configured to alternately turn on the second upper arm and the second lower arm of the first bridge circuit such that on-periods thereof do not overlap each other to increase power stored in the resonance capacitor of the first bridge circuit in a state in which the first leg of the first bridge circuit is turned off when transmitting power from the second bridge circuit to the first bridge circuit and performing step-up operation,
wherein the controller is configured to control at least one of the on-period of the second upper arm of the first bridge circuit and the on-period of the second lower arm of the first bridge circuit when the second upper arm and the second lower arm are turned on alternately to perform the step-up operation,
wherein the controller is configured to control the on-period of the second upper arm of the first bridge circuit and the on-period of the second lower arm of the first bridge circuit when performing the step-up operation, and
wherein the controller is configured to, when transmitting the power from the second bridge circuit to the first bridge circuit and performing the step-up operation, turn off the second upper arm and the second lower arm of the first bridge circuit such that off-times thereof overlap each other, and store the power in a smoothing capacitor provided in parallel to the first leg and the second leg of the first bridge circuit.