Patent ID: 11929676
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F | IPC F  H

Claim 0:
1. A power conversion apparatus comprising:
a converter circuit comprising unit converters corresponding to a respective plurality of phases and converting an alternating current voltage output from an alternating current power supply into a direct current voltage, the unit converters each comprising a reactor and at least one switching element;
a current detector detecting a sum of currents flowing through the reactors;
a voltage detector detecting an output voltage of the converter circuit; and
a control device generating a reference duty on a basis of detection values detected by the current detector and by the voltage detector, and generating a pulse width modulation signal for controlling the switching element on a basis of a result of comparison between a corrected duty and a carrier signal, the corrected duty being obtained by correcting the reference duty, wherein
a carrier period is shorter than a power supply period, the carrier period being a period of the carrier signal and the power supply period being a period of the alternating current voltage,
when a first reference duty in a first carrier period differs from a second reference duty in a second carrier period subsequent to the first carrier period, a first corrected duty and a second corrected duty are controlled to have different values from each other,
the first corrected duty is a corrected duty of a first phase in a first carrier period in one power supply period after, and
the second corrected duty is a corrected duty of a second phase in the first carrier period in the one power supply period after.