POWER CONVERSION DEVICE

PROBLEM TO BE SOLVED: To miniaturize a power conversion device, reduce its weight, and improve its efficiency by reducing a switching loss even if a switching frequency is not decreased. SOLUTION: In a three-level power conversion device for converting DC to AC, for PWM control a dipolar modulation...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	TERUNUMA MUTSUHIRO, NAKADA KIYOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROL OR REGULATION THEREOF CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES ELECTRICITY ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS GENERATION MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES PERFORMING OPERATIONS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To miniaturize a power conversion device, reduce its weight, and improve its efficiency by reducing a switching loss even if a switching frequency is not decreased. SOLUTION: In a three-level power conversion device for converting DC to AC, for PWM control a dipolar modulation mode for outputting pulses alternately in positive and negative directions over one cycle of the output voltage of the power conversion device and a unipolar modulation mode for outputting pulses with the same polarity during the half cycle of an output voltage are used. A means 21 is provided for enabling the dipolar modulation mode when an operation mode is in power-running operation mode or when the output voltage rises and for enabling the dipolar modulation mode when the operation mode is in a regeneration operation mode or when the output voltage decreases.