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US 6,437,997 B1Granted
Control device for electric power translating device
AssigneeHitachi, Ltd.
InventorsSatoru Inarida, Tokunosuke Tanamachi, Kiyoshi Nakata
Life of this patent
Estimating the term…
Abstract
An electric power translating device employs a converter for converting an AC source voltage into a DC voltage, a smoothing capacitor connected at the DC side of the converter, an inverter for inverting the DC from the smoothing capacitor into an AC and for supplying the AC to an AC motor and means for controlling the voltage, frequency or phase in the AC output from the inverter. The device further includes means for regulating at least one of voltage, frequency and phase in the AC output of the inverter based on a ripple frequency component contained in the AC output of the inverter and associated with the rectification by the converter. Whereby, beat phenomenon caused by rectification ripple is suppressed.
Claims32
An electric power translating device comprising:
- a converter for converting an AC source voltage into a DC voltage through rectification;
- a smoothing capacitor connected at the DC side of the converter;
- an inverter for inverting the DC voltage across the smoothing capacitor into an AC and for supplying the AC to an AC motor;
- and
- means for controlling the AC output from the inverter, which controls the AC output of the inverter based on a ripple frequency component contained in the AC output of the inverter and related to the rectification by the converter.
2 more elements
An electric power translating device comprising:
- a converter for converting an AC source voltage into a DC voltage through rectification;
- a smoothing capacitor connected at the DC side of the converter;
- an inverter for inverting the DC voltage across the smoothing capacitor into an AC and for supplying the AC to an AC motor;
- and
- means for controlling the AC output from the inverter, which extracts a ripple frequency component contained in the AC output of the inverter and related to the rectification by the converter and controls the AC output of the inverter based on the extracted ripple frequency component.
2 more elements
An electric power translating device comprising:
- a converter for converting an AC source voltage into a DC voltage through rectification;
- a smoothing capacitor connected at the DC side of the converter;
- an inverter for inverting the DC voltage across the smoothing capacitor into an AC and for supplying the AC to an AC motor;
- and
- means for controlling the AC output from the inverter, which controls the AC output of the inverter based on a ripple frequency component contained in the AC output of the inverter and related to the rectification by the converter,
- wherein said control means controls the AC output from the inverter in a direction of suppressing beat phenomenon caused by the rectification ripple.
3 more elements
An electric power translating device comprising:
- a converter for converting an AC source voltage into a DC voltage through rectification;
- a smoothing capacitor connected at the DC side of the converter;
- an inverter for inverting the DC voltage across the smoothing capacitor into an AC and for supplying the AC to an AC motor;
- and
- means for controlling the AC output from the inverter which extracts a ripple frequency component contained in the AC output of the inverter and relating to the rectification by the converter and controls the AC output of the inverter base and the extracted ripple frequency component,
- wherein said control means controls the AC output from the inverter in a direction of suppressing beat phenomenon caused by the rectification ripple.
3 more elements
An electric power translating device comprising:
- a converter for converting a single phase AC source voltage into a DC voltage through rectification;
- a smoothing capacitor connected at the DC side of the converter;
- an inverter for inverting the DC voltage across the smoothing capacitor into a three phase AC and for supplying the three phase AC to a three phase AC motor;
- and
- means for controlling the three phase AC output from the inverter, which controls the three phase AC output of the inverter based on a ripple frequency component contained in the three phase AC output of the inverter and related to the rectification by the converter.
2 more elements
An electric power translating device comprising:
- a converter for converting a single phase AC source voltage into a DC voltage through rectification;
- a smoothing capacitor connected at the DC side of the converter;
- an inverter for inverting the DC voltage across the smoothing capacitor into a three phase AC and for supplying the three phase AC to a three phase AC motor;
- and
- means for controlling the three phase AC output from the inverter, which extracts a ripple frequency component contained in the three phase AC output of the inverter and related to the rectification by the converter and controls the three phase AC output of the inverter based on the extracted ripple frequency component.
2 more elements
An electric power translating device comprising:
- a converter for converting a single phase AC source voltage into a DC voltage through rectification;
- a smoothing capacitor connected at the DC side of the converter;
- an inverter for inverting the DC voltage across the smoothing capacitor into a three phase AC and for supplying the three phase AC to a three phase AC motor;
- and
- means for controlling the three phase AC output from the inverter;
- which controls the three phase AC output of the inverter based on a ripple frequency component contained in the three phase AC output of the inverter and related to the rectification by the converter,
- wherein said control means controls the three phase AC output from the inverter in a direction of suppressing beat phenomenon caused by the rectification ripple.
4 more elements
An electric power translating device comprising:
- a converter for converting a single phase AC source voltage into a DC voltage through rectification;
- a smoothing capacitor connected at the DC side of the converter;
- an inverter for inverting the DC voltage across the smoothing capacitor into a three phase AC and for supplying the three phase AC to a three phase AC motor;
- and
- means for controlling the three phase AC output from the inverter, which extracts a ripple frequency component contained in the three phase AC output of the inverter and related to the rectification by the converter and controls the three phase AC output of the inverter based on the extracted ripple frequency component,
- wherein said control means controls the three phase AC output from the inverter in a direction of suppressing beat phenomenon caused by the rectification ripple.
3 more elements
Dependencies are inferred from the claim text.