Soft start control method and device of frequency converter and soft start control circuit

The invention discloses a soft start control method and device of a frequency converter and a soft start control circuit. The soft start control method of the frequency converter comprises the following steps: acquiring bus voltage; when the bus voltage is smaller than a preset first threshold value...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: ZHANG TONGSHI, ZHANG YANTING, ZHOU WEIBANG
Format: Patent
Sprache:chi ; eng
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Beschreibung
Zusammenfassung:The invention discloses a soft start control method and device of a frequency converter and a soft start control circuit. The soft start control method of the frequency converter comprises the following steps: acquiring bus voltage; when the bus voltage is smaller than a preset first threshold value, a first synchronizing signal with the movable interval of a trigger angle being [90 degrees, 180 degrees] is adopted; and when the bus voltage is greater than or equal to the first threshold value, adopting a second synchronizing signal of which the movable interval of the trigger angle is [0 degree, 180 degrees]. A first synchronizing signal and a second synchronizing signal are adopted for soft start, the first synchronizing signal is used for the bus voltage rising process (from 0V to), the interval is 90 degrees, namely, the movable interval of a trigger angle is [90 degrees, 180 degrees], the trigger angle can be reduced from 180 degrees to 90 degrees along with rising of the bus voltage, and the trigger ang