| 摘要 |
PURPOSE:To reduce the ripple of an output current in a converter part. CONSTITUTION:In the control method of a DC link parallel resonance-type power converter, at least one resonance phenomenon period is provided between the zero-voltage period of a resonant capacitor 3 constituting the DC link parallel resonance-type power converter and a resonance phenomenon period in which the switching pattern of an inverter part 4 decided within the zero-voltage period is output actually. During the zero-voltage period, the control amount of the part of the converter at the start of a zero-voltage period of next time is found by an estimation operation device 10 by using a switching pattern, of next time, which is output during a resonance phenomenon period immediately after the finish of the zero-voltage period. The estimated value of the control amount is compared with a control-amount instruction value by a comparator 1, switching-pattern data is obtained, and, on the basis of it, the switching pattern of a resonance phenomenon period of two times later is decided by a shift register 12. |
