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

Claim 6:
7. A polyphase power-supply device comprising:
an input terminal;
an output terminal;
first to N-th DC-DC converters connected in parallel to one another between the input terminal and the output terminal, where N is an integer equal to or greater than two; and
a switching controller configured to perform interleave control on the first to N-th DC-DC converters by supplying first to N-th pulse width modulation (PWM) signals to the first to N-th DC-DC converters, respectively, wherein
a phase of a k-th PWM signal out of the first to N-th PWM signals is delayed by a phase of 360°/N from a (k−1)-th PWM signal, where k is any integer satisfying 2≤k≤N), and
the switching controller is configured to:
change a switching frequency of the first PWM signal from a first frequency to a second frequency at a change time point when a certain cycle of the first PWM signal starts;
obtain a differential time D by dividing, by N, a period difference calculated by subtracting a period T2 of the second frequency from a period T1 of the first frequency as D=(T1−T2)/N;
cause a length of a first cycle of the k-th PWM signal appearing firstly after the change time point to be T2−D×(k−1); and
cause lengths of cycles after the first cycle of the k-th PWM signal after the change time point to be the period T2.