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

Claim 4:
5. The polyphase power-supply device according to claim 3, wherein
in a case that the switching frequency increases in response to a frequency change signal supplied from the spread spectrum circuit, the switching controller is configured to:
change rising timings of the on-duty durations of the PWM signals of the second phase to the N-th phase appearing firstly after the frequency change signal is supplied, the on-duty rising timing being changed sequentially by an absolute value of D for the PWM signal of the second phase to by an absolute value of the product of D and (N−1) for the PWM signal of the N-th phase; and
shorten the first cycles of the PWM signals of the second phase to the N-th phase appearing firstly after the switching frequency is changed, the first cycles being changed sequentially by the time D for eh PWM signal of the second phase to by the product of D and (N−1) for the PWM signal of the N-th phase, and

in a case that the switching frequency decreases in response to the frequency change signal supplied from the spread spectrum circuit, the switching controller is configured to:
change a timing of switching from an on-duty duration to an off-duty duration of the PWM signals of the second phase to the N-th phase appearing firstly after the frequency change signal is supplied, the timing being changed sequentially by the absolute value of D for the PWM signal of the second phase to by the absolute value of the product of D and (N−1) for eh PWM signal of the N-th phase; and
extend the first cycles of the PWM signals of the second phase to the N-th phase appearing firstly after the switching frequency is changed, the first cycles sequentially by the time D for the PWM signal of the second phase being changed by the product of D and (N−1) for the PWM signal of the N-th phase.