Patent ID: 11967904
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A polyphase power-supply device comprising: an input terminal; an output terminal; a plurality of DC-DC converters of first to N-th phases connected in parallel to one another between the input terminal and the output terminal; and a switching controller, wherein the switching controller is configured to: supply pulse width modulation (PWM) signals of the first to N-th phases performing interleave control on an operation of the plurality of DC-DC converters of the first to N-th phases, the first to N-th phases having a phase difference obtained by dividing 360° by N from one another; change a switching frequency of the PWM signals from a first frequency to a second frequency; provide a difference time D by dividing, by N, a value obtained by subtracting a period of the second frequency from a period of the first frequency; supply respective first cycles of the PWM signals of the second to N-th phases appearing firstly after changing the switching frequency at respective timings of the respective first cycles by an amount changing sequentially from the differential time D for a PWM signal of the second phase to a product of D and (N−1) for a PWM signal of the N-th phase; and supply respective second and subsequent cycles of the PWM signals of the first to the N-th phases after the switching frequency is changed so as to control the operation of the plurality of DC-DC converters from the first to N-th phases at the second frequency, rising timings of on-duty durations of the respective second and subsequent cycles from the first to N-th phases being changed sequentially by a phase difference obtained by dividing 360° by N, the respective second and subsequent cycles from the first to N-th phases having a same length.